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Paul B. Eskridge, Jay A. Frogel, Richard W. Pogge et et al., «Near-Infrared and Optical Morphology of Spiral Galaxies», The Astrophysical Journal Supplement Serie, vol.143, no1, , p.73-111 (DOI10.1086/368640, Bibcode2002ApJS..143...73E, lire en ligne[PDF])
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A.M. Garcia, «General study of group membership. II -Determination of nearby groups», Astronomy and Astrophysics Supplement Series, vol.100 #1, , p.47-90 (Bibcode1993A&AS..100...47G, lire en ligne)|format=PDF
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Debra Meloy Elmegreen, Bruce G. Elmegreen, Jay A. Frogel, Paul B. Eskridge, Richard W. Pogge, Andrew Gallagher et Joel Iams, «Arm Structure in Anemic Spiral Galaxies», The Astronomical Journal, vol.124, no2, , p.777-781 (DOI10.1086/341613, Bibcode2002AJ....124..777E, lire en ligne[PDF])
Paul B. Eskridge, Jay A. Frogel, Richard W. Pogge et et al., «Near-Infrared and Optical Morphology of Spiral Galaxies», The Astrophysical Journal Supplement Serie, vol.143, no1, , p.73-111 (DOI10.1086/368640, Bibcode2002ApJS..143...73E, lire en ligne[PDF])
Debra Meloy Elmegreen, Bruce G. Elmegreen, Jay A. Frogel, Paul B. Eskridge, Richard W. Pogge, Andrew Gallagher et Joel Iams, «Arm Structure in Anemic Spiral Galaxies», The Astronomical Journal, vol.124, no2, , p.777-781 (DOI10.1086/341613, Bibcode2002AJ....124..777E, lire en ligne[PDF])
Paul B. Eskridge, Jay A. Frogel, Richard W. Pogge et et al., «Near-Infrared and Optical Morphology of Spiral Galaxies», The Astrophysical Journal Supplement Serie, vol.143, no1, , p.73-111 (DOI10.1086/368640, Bibcode2002ApJS..143...73E, lire en ligne[PDF])
Abraham Mahtessian, «Groups of galaxies. III. Some empirical characteristics», Astrophysics, vol.41, no3, , p.308-321 (DOI10.1007/BF03036100, lire en ligne, consulté le )
Abraham Mahtessian, «Groups of galaxies. III. Some empirical characteristics», Astrophysics, vol.41, no3, , p.308-321 (DOI10.1007/BF03036100, lire en ligne, consulté le )