Binney, J., Davies, R., & Illingworth, G. (1990). VELOCITY MAPPING AND MODELS OF THE ELLIPTIC GALAXIES NGC 720, NGC 1052, AND NGC 4697. Institute of Physics Publishing.
Chicago-referens (17:e uppl.)Binney, J., R. Davies, och G. Illingworth. VELOCITY MAPPING AND MODELS OF THE ELLIPTIC GALAXIES NGC 720, NGC 1052, AND NGC 4697. Institute of Physics Publishing, 1990.
MLA-referens (9:e uppl.)Binney, J., et al. VELOCITY MAPPING AND MODELS OF THE ELLIPTIC GALAXIES NGC 720, NGC 1052, AND NGC 4697. Institute of Physics Publishing, 1990.
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