Drozdovsky, I. O; Karachentsev, I. D (2000). “Photometric distances to six bright resolved galaxies”. Astronomy and Astrophysics Supplement142 (3): 425-432. Bibcode: 2000A&AS..142..425D. doi:10.1051/aas:2000155.
R. M. Gonzalez Delgado, E. Perez, C. Tadhunter J. M. Vilchez, J. M. Rodriguez-Espinosa (2000). “H II Region Population in a Sample of Nearby Galaxies with Nuclear Activity. I. Data and General Results”. Astrophysical Journal Supplement108 (1): 155. Bibcode: 1997ApJS..108..155G. doi:10.1086/312951.
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Drozdovsky, I. O; Karachentsev, I. D (2000). “Photometric distances to six bright resolved galaxies”. Astronomy and Astrophysics Supplement142 (3): 425-432. Bibcode: 2000A&AS..142..425D. doi:10.1051/aas:2000155.
R. M. Gonzalez Delgado, E. Perez, C. Tadhunter J. M. Vilchez, J. M. Rodriguez-Espinosa (2000). “H II Region Population in a Sample of Nearby Galaxies with Nuclear Activity. I. Data and General Results”. Astrophysical Journal Supplement108 (1): 155. Bibcode: 1997ApJS..108..155G. doi:10.1086/312951.