I. Appenzeller: Polarisationsmessungen von Beta Lyrae, Mitt. Astron. Gesellschaft 19, 34 (1965)
I. Appenzeller: Polarimetric observations of spiral galaxies, Astron. J. 72, 783 (1967)
I. Appenzeller: Interstellar magnetic pockets, Mitt. Astr. Gesellschaft 30, 154 (1971)
I. Appenzeller and K. Fricke: Hydrodynamic model calculations for dynamically unstable supermassive stars, Mitt. Astron. Gesellschaft 31, 126 (1972)
I. Appenzeller: The frequency of YY Orionis objects among the T Tauri stars, Proc. IAU Colloquium 42, (=Veroeff. Remeis-Sterwarte Bamberg XI, No. 121) p. 80 (1977)
I. Appenzeller, C. Moellenhoff, R. Mundt, B. Wolf: The image tube spectrograph of the Landessternwarte Heidelberg, Mitt. Astron. Gesellschaft 43, 157 (1978)
I. Appenzeller and H. Zekl: A computer method for spectral classification, Proc. IAU Symposium 80, 23 (1978)
I. Appenzeller: Ten nights at the Very Large Telescope, The Messenger 15, 4 (1978)
H. Zekl and I. Appenzeller: Two dimensional spectral classification using a computer, Proc. IAU Colloquium 47, Special Issue of Ricerche Astronomiche, Vol. 9, eds. M.F. McCarthy, A.G.D. Philip, G.V. Coyne, p. 287 (1979)
I. Appenzeller, C. Bertout, R. Mundt, J. Krautter: High resolution IUE observations of the Mg II resonance lines in the T Tauri star S CrA, Mitt. Astron. Gesellschaft 52, 15 (1981)
I. Appenzeller, O. Stahl, B. Wolf: The Hubble-Sandage variable HDE 269006: A hot supergiant with a cool envelope, The Messenger 25, 2 (1981)
I. Appenzeller: Protostars and pre-main sequence objects,in Landolt-Boernstein, Zahlenwerte und Funktionen aus Naturwissenschaft und Technik, Neue Serie, Band VI/2b, Springer Verlag, p. 357 (1982)
I. Appenzeller and U. Finkenzeller: Linienprofile von Herbig-Ae-Be-Sternen, Mitt. Astron. Gesellschaft 55, 20 (1982)
J.G. Schiffer, I. Appenzeller, R. Oestreicher: Experiences with the fiber-linked spectrograph of the Landessternwarte, Mitt. Astron. Gesellschaft 57, 323 (1982)
I. Appenzeller, G. Klare, O. Stahl, B. Wolf, F.-J. Zickgraf: CASPEC and IUE: A perfect match, The Messenger 38, 28 (1984)
I. Appenzeller and H. Nicklas: Ein optisches 10-Meter-Teleskop fuer die deutsche Astronomie, I. Sterne und Weltraum 24, 574 (1985)
I. Appenzeller: The DGT: A complement to ESO's VLT, Mitt. Astron. Gesellschaft 67, 211 (1986)
I. Appenzeller and R Oestreicher: The high-ionization lines of the Seyfert galaxy NGC 4507, Mitt. Astron. Gesellschaft 67, 414 (1986)
I. Appenzeller, B. Wolf, O. Stahl: An extended nebulosity surrounding the S Dor variable R 127, in "Instabilities in Luminous Early-type Stars", eds. H.J.G.L.M. Lamers and C.W.H. de Loore, D. Reidel Publ., Dordrecht 1987, p. 241 (1987)
G. Kraemer, I. Appenzeller, N. Eberhard, M. Grewing, W. Gringel, A. Kaelble, N. Kappelmann, J. Krautter, H. Mandel, I. Petrick, I. Riegger: ORFEUS: Ein 1-m-EUV/FUV-Teleskop fuer den Einsatz auf einer frei fliegenden Platform, Mitt. Astron. Gesellschaft 68, 207 (1987)
I. Appenzeller: The optical concept of the DGT, in Proc. ESO Conference on Very Large Telescopes and their Instrumentation, ed. M.-H. Ulrich, ESO 1988, p. 177 (1988)
I. Appenzeller, J. Krautter, H. Mandel, R. Oestreicher,: ORFEUS focal plane instrumentation: The Echelle Spectrograph, in Proc. Celebr. Symposium "A Decade of UV Astronomy with IUE", ed. E.J. Rolfe, ESA SP-281, Vol. 2, p. 337 (1988)
I. Appenzeller and S. Wagner: High-resolution spectroscopy of extended emission line regions, in ESO Conference and Workshop Proceedings No. 32, eds. E.J.A. Meurs and R.A.E. Fosbury, ESO 1989, p. 183 (1989)
I. Appenzeller and S. Wagner: Probing the hidden secrets of Seyfert nuclei, The Messenger 60, 40 (1990)
R. Becker, I. Appenzeller, C. Henkel, P. Schilke, T.L. Wilson, J.G.A. Wouterloot: Giant molecular cloud complexes in irregular galaxies, in "The Physics of and Chemistry of Interstellar Molecular Clouds", eds. G. Winnewisser and J.T. Armstrong, Springer Lecture Notes in Physics 331, 276 (1989)
I. Appenzeller: Alignment of circumstellar H-H flows by the interstellar magnetic field, in Proc. IAU Symposium 140 ("Galactic and Intergalactic Magnetic Fields"), 331 (1990)
G. Kraemer, N. Eberhard, M. Grewing, W. Gringel, A. Kaelble, N. Kappelmann, J. Petrik, J. Riegger, I. Appenzeller, J. Krautter, H. Mandel, R. Oestreicher: High resolution FUV spectroscopy with the ORFEUS telescope, in "New Windows to the Universe", eds. S. Sanches and M. Vazquez, Cambridge University Press 1990, p. (1990)
M. Grewing, G. Kraemer, I. Appenzeller, N. Eberhard, W. Gringel, A. Kaelble, N. Kappelmann, J. Krautter, H. Mandel, R. Oestreicher, J. Petrik, J. Riegger,: The ORFEUS Mission, in "Extreme Ultraviolet Astronomy", eds. R. Malina and S. Bowyer, Pergamon Press, New York 1991, p. 437 (1991)
G. Kraemer, J. Barnstedt, N.Eberhard, M. Grewing, W. Gringel, A. Kaelble, N. Kappelmann, J. Petrik, I. Appenzeller, J. Krautter, H. Mandel, R. Oestreicher, S. Bowyer, M. Hurwitz: Far and extreme ultraviolet astronomy with ORFEUS, in Proc. IAU Colloquium 123, ed Y. Kondo, Kluwer Publ. Dordrecht 1990, p. 177 (1991)
I. Appenzeller: Astronomy with small telescopes at European sites, EAS Newsletter 4, 2 (1992)
I. Appenzeller, K. Bahner, E.D. Knohl, Ch. Kuehne, H. Nicklas, P. Ruemmer, J. Schulte in den Baeumen: A feasibility study of a moderately segmented 12-m mirror, in "Progress in Telescope and Instrumentation Technologies", ESO Conference Proceedings No. 42, ed. M.-H. Ulrich, p. 109 (1992)
I. Appenzeller, K.H. Duensing, K. Fricke, S. Gong, H.J. Hess, S. Kiesewetter, R.-P. Kudritzki, S. M\"ohler, B. Muschielok, H. Nicklas, R. \"Ostreicher, M. Roth, G. Rupprecht, W. Seifert, O.Stahl: FORS: A multi-purpose instrument for the ESO VLT, in "Progress in Telescope and Instrumentation Technologies", ESO Conference Proceedings No. 42, ed. M.-H. Ulrich, p. 577 (1992)
I. Appenzeller and G. Rupprecht: FORS - The focal reducer for the VLT, The Messenger 67, 18 (1992)
I. Appenzeller and S. Wagner: Forbidden high ionization lines in Quasars, in "Physics of Active Galactic Nuclei", eds. W. Duschl and S. Wagner, Springer, Heidelberg 1992, p. 389 (1992)
P. Zeidler, I. Appenzeller, K.-H. Hofmann, W. Mauder, S. Wagner, G. Weigelt: High resolution speckle masking observations of the Seyfert galaxy NGC 1386, in "Physics of of Active Galactic Nuclei", eds. W. Duschl and S. Wagner, Springer, Heidelberg 1992, p. 440 (1992)
P. Zeidler, I. Appenzeller, K.-H. Hofmann, W. Mauder, S. Wagner, G. Weigelt: "High resolution speckle masking observations of the Seyfert galaxy NGC 1386, in High Resolution Imaging by Interferometry II", eds. J.M. Beckers and F. Merkle, ESO Conference Proceedings No. 41, p. 109 (1992)
I. Appenzeller, C. Chavarria, L. Corral, T. Fleming, G. Hasinger, J. Krautter, R. Mujica, M. Pakull, L. Terranegra, J. Truemper, F.-J. Zickgraf,: "Optical identification of ROSAT X-ray sources at the Guillermo Haro Observatory", Revista Mexicana de Astronomia y Astrofisica 26 (Special Issue), p. 98 (1993)
I. Appenzeller: Die Suche nach der Unbekannten Materie, in "Vom Urknall zum komplexen Universum. Die Kosmologie der Gegenwart", eds. G. Boerner, J. Ehlers, H. Meier, Pieper-Verlag 1993, p. 109 (1993)
N. Epchtein, B. de Batz, E. Copet, P. Fouquet, F. Lacombe, T. Le Bertre, G. Mamon, D. Rouan, D. Tiphene, W. B. Burton, E. Deul, H. Habing, J. Borsenberger, M. Dennefeld, A. Omont, J. C. Renault, B. Rocca-Volmerange, S. Kimeswenger, I. Appenzeller, R. Bender, T. Forveille, F. Garzon, J. Hron, P. Persi, M. Ferrari-Toniolo, I. Vauglin: DENIS: A Deep Near-infrared Survey of the Southern Sky, in "Science with astronomical near-infrared sky surveys", eds. N. Epchtein et al., Kluwer, Dordrecht, (1994), p. 3-9
I. Appenzeller, W. Fuertig, R. Harke, H.J. Hess, S. Kiesewetter, B. Muschielok, H. Nicklas, W. Seifert: The FORS Instruments for the ESO VLT, in AG Abstract Series 11, (1995), p. 40
F.-J. Zickgraf, I. Thiering, J. Krautter, I. Appenzeller, R. Kneer, W. Voges, A. Serrano, R. Mujica: The LSW-INAOE-MPE project for the optical identification of a complete sample of northern ROSAT survey sources, in "Roentgenstahlung from the Universe", H.U. Zimmermann et al. eds. MPE Report 263 (1996), p. 665
J.H.M.M. Schmitt, J. Krautter, I. Appenzeller, H. H. Mandel, J. Barnstedt, M. Goelz, M. Grewing, M. Gringel, W. Haas, W. Hopfensitz, N. Kappelmann, G. Kraemer: ORFEUS FUV Spectra of Late-type Stars, in "Cool Stars, Stellar Systems, and the Sun", 9th Cambridge Workshop, R. Pallavicini and A. K. Dupree eds., A.S.P. Conference Series 109, (1996), p. 287
M. Grewing, I. Appenzeller, J. Barnstedt, S. Bowyer, M. Hurwitz, G. Kraemer, N. Kappelmann, J. Krautter, H. Mandel: ORFEUS, in "Ultraviolet Astrophysics beyond the IUE Final Archive", B. Harris ed., ESA SP Vol. 413 (1998) p. 757
M. Schmid, I. Appenzeller, J. Krautter, H. H. Mandel, T. Dumm, U. Muerset, H. Schild, W. Schmutz, J. Barnstedt, M. Goelz, M. Grewing, M. Gringel, W. Haas, W. Hopfensitz, N. Kappelmann, G. Kraemer: "ORFEUS Spectroscopy of the O VI Lines in Symbiotic Stars and the Raman Scattering Process", in "Ultraviolet Astrophysics beyond the IUE Final Archive", B. Harris ed., ESA SP Vol. 413, (1998) 357
J. Krautter, I. Appenzeller, H. Mandel, M. Schmid, J. Barnstedt, M. Goelz, M. Grewing, M. Gringel, W. Haas, W. Hopfensitz, N. Kappelmann, G. Kraemer: ORFEUS Spectroscopy of the Symbiotic Star RR Tel, in "Ultraviolet Astrophysics beyond the IUE Final Archive", B. Harris ed., ESA SP Vol. 413, (1998) 347
H. Widmann, G. Kraemer, I. Appenzeller, J. Barnstedt, A. Fromm, M. Goelz, M. Grewing, M. Gringel, W. Haas, W. Hopfensitz, N. Kappelmann, J. Krautter, J. Lindenberger, H. Mandel: ORFEUS Far Ultraviolet Spectra of the LMC Stars HDE 269546 and HD 36402, in "Ultraviolet Astrophysics beyond the IUE Final Archive", B. Harris ed., ESA SP Vol. 413, (1998) 509
F.-J. Zickgraf, J. Krautter, I. Appenzeller, I. Thiering, W. Voges, R. Mujica, M. Pakull, A. Serrano, C. Chavarria: Identification of a Complete Sample of Northern ROSAT All-Sky Survey X-ray Sources, Astron. Nachrichten 319 (1998) 42
I. Appenzeller, K. Fricke, W. Fuertig, et al.: Successful Commissioning of FORS1 - the First Optical Instrument on the VLT. The Messenger 94, 1 (1998)
H.M. Schmid, J. Krautter, I. Appenzeller, H. Mandel: FUV ORFEUS Spectroscopy of the slowly evolving Symbiotic Nova RR Tel, in "Unsolved Problems of Stellar Evolution", M. Livio ed., STScI 1999, p. 77, (1999)
A. Eckart, S. Hippler, A. Glindemann, et al.: ALFA: The MPIA/MPE Laser Guide Star AO System. Experimental Astronomy 10, 1 (2000)
M. Pfeiffer, I. Appenzeller, S. Wagner: Coronal lines and the warm X-ray absorber in Seyfert 1 galaxies. New Astronomy Rev. 44, 547 (2000)
I. Appenzeller, R. Kneer, F.-J. Zickgraf, J. Krautter, I. Thiering: The cluster population of a complete sample of optically identified RASS X-ray sources, in "From Extrasolar Planets to Cosmology: The VLT opening Symposium", J. Bergeron and A. Renzini, eds., Springer 2000, p. 131
W. Hummel, W. Gaessler, B. Muschielok, et al.: Proc. SPIE 4005, 95 (2000)
H.-M. Schmid, I. Appenzeller, M. Camenzind, M. Dietrich, J. Heidt, H. Schild, S. Wagner: VLT spectropolarimetry of bright Seyfert 1 galaxies. Proc. SPIE 4005, 264 (2000)
S. Wagner, W. Seifert, I. Appenzeller, et al.: Studies of non-thermal emission from AGN through polarization observations at the VLT. Proc. SPIE 4005, 95 (2000)
H. Mandel, I. Appenzeller, D. Bomans, et al.: LUCIFER: a NIR spectrograph and imager for the LBT. Proc. SPIE 4008, 767 (2000)
W. Seifert, I. Appenzeller, W. Fuertig, et al.: Commissioning of the FORS instruments at the ESO VLT. Proc. SPIE 4008, 96 (2000)
I. Appenzeller: Der Blick zum Ursprung des Kosmos, in "Wissenschaft 2000", H.Vogt ed., Universitaetsverlag C. Winter, Heidelberg 2000, p 131.
F.-J. Zickgraf, R. Mujica, V.H. Chavushian, I. Appenzeller, J. Krautter, A. Serrano: Optical identification of X-ray sources in a high X-ray flux sensitivity area from the RASS. Proc. IAU Colloquium 184 ("AGN Surveys") 80, (2001)
I. Appenzeller: Extragalactic Astronomy with Lucifer, in "Science with the Large Binocular Telescope", T. Herbst, ed. Neuman Druck (2001), p. 69
H. Mandel, I. Appenzeller, D., Bomans, et al.: LUCIFER: A NIR Spectrograph and Imager for the LBT, in "Science with the Large Binocular Telescope", T. Herbst, ed. Neuman Druck (2001), p. 177
I. Appenzeller, R. Angel, S. Kulkarni, R. Rebolo, A. Renzini: Panel Discussion, in "Science with the Large Binocular Telescope", T. Herbst, ed. Neuman Druck (2001), p. 211
J. Heidt, I. Appenzeller, R. Bender, K. Fricke, and the FDF Team: The FORS Deep Field. ApSS 277, 539 (2001)
D. Mehlert, S. Noll, I. Appenzeller, et al.: The FORS Deep Field: First spectroscopic results, in "Deep Fields" S. Cristiani et al. eds., Springer 2001, p. 162
M.W. Kuemmel, J. Heidt, S. Wagner, I. Appenzeller, et al.: Number counts and angular correlation functions in the FORS Deep Field. in "Deep Fields" S. Cristiani et al. eds., Springer 2001, p. 159
R. Bender, I. Appenzeller, A. Boehm, et al.: The FORS Deep field: Photometric data and photometric redshifts. in "Deep Fields" S. Cristiani et al. eds., Springer 2001, p. 96
J.F. Donati, C. Catala,G. Mathys, et al: High-resolution spectropolarimetry on the VLT. Proc. ESO Workshop on Scientific Drivers for future ESO VLT/VLTI Instruments, p. 238 (2001)
H.M. Schmid, I. Appenzeller, J.O. Stenflo, A. Kaufer: Imaging polarimetry and spectropolarimetry of bright objects. Proc. ESO Workshop on Scientific Drivers for future ESO VLT/VLTI Instruments, p. 231 (2001)
D. Mehlert, S. Noll, I. Appenzeller: The stellar population of high-redshift galaxies, in "Lighthouses of the Universe", Gilfanov et al. eds. Springer 2002, p. 335 (2002)
M. Dietrich, F. Hamann, I. Appenzeller, M. Vestergaard, S. Wagner: Quasar Evolution and Star Formation History, in "Lighthouses of the Universe", Gilfanov et al. eds. Springer 2002, p. 329 (2002)
J. Heidt, I. Appenzeller, R. Bender, K. Fricke, eta l.: The FORS Deep Field: Photometry, photometric redshifts and first spectroscopic results. ApSS 281, 593 (2002)
D. Mehlert, S. Noll, I. Appenzeller: Evidence for chemical evolution in the spectra of high redshift galaxies. ApSS 284, 437 (2003)
J. Heidt, I. Appenzeller, A. Gabasch, K. Jaeger, S. Seitz, et al.: The FORS Deep Field: The photometric catalog. ApSS 284, 385 (2003)
W. Seifert, I. Appenzeller, H. Baumeister, et al.: LUCIFER: A multimode instrument for the LBT. Proc. SPIE 4841, 962 (2003)
U. Borgest, J. Staude, I. Appenzeller, et al.: Das Junge Universum. Sterne Und Weltraum. Sondernummer 01/03 (2003)
M. Dietrich, F. Hamann, J. Shields, A. Constantin, I. Appenzeller, S.J. Wagner: Elemental Abundances and High Redshift Quasars. Revista Mexicana AC 17, 264 (2003)
M.A. Moreno-Corral, C. Chavarria-K., I. Appenzeller: Enrico Martinez. Ein Astronom aus Hambur in Neu-Spanien. Sterne und Weltraum 42, 44 (2003)
A. Gabasch, R. Bender, U. Hopp, R. Saglia, S. Seitz, J. Snigula, I. Appenzeller, J. Heidt, et al.: Evolution of the galaxy luminosity function in the FORS Deep Field (FDF). Proc. Conf. on Multiwavelength Cosmology, M. Plionis ed. Kluwer (2004), p. 39
I. Appenzeller, D. Mehlert, S. Noll, R. Bender, A. Boehm, et al.: High Redshift Galaxies in the FORS Deep Field. in Studies of Galaxies in the Young Universe with New Generation Telescopes, N. Arimoto and W. Duschl eds. (2004)
I. Appenzeller, S. Noll, O. Stahl, S. Frank: The Metall Absorption Systems of the FDF QSO 0103-260. Proc. IAU Symposium 217 (Recycling intergalactic and interstellar matter), p. 266 (2004)
I. Appenzeller: Summary and concluding remarks. Proc. IAU Symposium 243 (Star-Disk Interaction in Young Stars), J. Bouvier and I. Appenzeller eds., Cambridge University Press, p. 365 (2007)
I. Appenzeller: Carl Wirtz und die Hubble-Beziehung. Sterne und Weltraum 48, Nr. 11, S. 44 (2009)
I. Appenzeller: Die Entwicklung junger Galaxien. Neues aus dem fruehen Kosmos. Sterne und Weltraum Vol. 49, Nr. 10, S. 35 (2010)
I. Appenzeller: Karl Friedrich Wilhelm Valentiner, Astronom. In: Badische Biographien, Neue Folge, Band VI, F.L. Sepaintner (ed.), Kohlhammer Verlag, Stuttgart (2011), S. 414
I. Appenzeller: Maximilian (Max) Wolf, Astronom. In: Badische Biographien, Neue Folge, Band VI, F.L. Sepaintner (ed.), Kohlhammer Verlag, Stuttgart (2011), S. 433
I. Appenzeller: Alexander A. Friedmann, Begruender der modernen Kosmologie. Sterne und Weltraum 3/2015 (2015), S. 34