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E. Florido; E. Battaner; M. Prieto; E. Mediavilla; và đồng nghiệp (1991). “Corrugations in the discs of spiral galaxies NGC 4244 and 5023”. Monthly Notices of the Royal Astronomical Society. 251 (2): 193–198. Bibcode:1991MNRAS.251..193F. doi:10.1093/mnras/251.2.193.
T. Bremnes; B. Binggeli P. Prugniel (ngày 23 tháng 3 năm 1999). “Structure and Stellar content of Dwarf Galaxies - III. B and R photometry of dwarf galaxies in the M101 group and the nearby field”. Astronomy and Astrophysics Supplement Series. 137 (2): 337–350. arXiv:astro-ph/9903348. Bibcode:1999A&AS..137..337B. doi:10.1051/aas:1999486.
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M. E. Sharina; I.D. Karachentsev & N. A. Tikhonov (1999). “Distances to Eight Nearby Isolated Low-Luminosity Galaxies”. Astronomy Letters. 25 (5): 322. Bibcode:1999AstL...25..322S.
E. Florido; E. Battaner; M. Prieto; E. Mediavilla; và đồng nghiệp (1991). “Corrugations in the discs of spiral galaxies NGC 4244 and 5023”. Monthly Notices of the Royal Astronomical Society. 251 (2): 193–198. Bibcode:1991MNRAS.251..193F. doi:10.1093/mnras/251.2.193.
T. Bremnes; B. Binggeli P. Prugniel (ngày 23 tháng 3 năm 1999). “Structure and Stellar content of Dwarf Galaxies - III. B and R photometry of dwarf galaxies in the M101 group and the nearby field”. Astronomy and Astrophysics Supplement Series. 137 (2): 337–350. arXiv:astro-ph/9903348. Bibcode:1999A&AS..137..337B. doi:10.1051/aas:1999486.