Karachentsev, I. D., & Grebel, E. K. (2001). WFPC2 observations of two dwarf spheroidal galaxies in the M 81 group. Astronomy and astrophysics, 375(2), . https://doi.org/10.1051/0004-6361:20010716
Chicago Style (17th ed.) CitationKarachentsev, Igor D., and Eva K. Grebel. "WFPC2 Observations of Two Dwarf Spheroidal Galaxies in the M 81 Group." Astronomy and Astrophysics 375, no. 2 (2001). https://doi.org/10.1051/0004-6361:20010716.
MLA (9th ed.) CitationKarachentsev, Igor D., and Eva K. Grebel. "WFPC2 Observations of Two Dwarf Spheroidal Galaxies in the M 81 Group." Astronomy and Astrophysics, vol. 375, no. 2, 2001, https://doi.org/10.1051/0004-6361:20010716.
Warning: These citations may not always be 100% accurate.