McLaughlin, Dean E.; Harris, William E.; Hanes, David A.. The spatial structure of the M87 globular cluster system. „Astrophysical Journal”. 422 (2), s. 486–507, 1994. DOI: 10.1086/173744. Bibcode: 1994ApJ...422..486M. (ang.).
McLaughlin, Dean E.; Harris, William E.; Hanes, David A.. The spatial structure of the M87 globular cluster system. „Astrophysical Journal”. 422 (2), s. 486–507, 1994. DOI: 10.1086/173744. Bibcode: 1994ApJ...422..486M. (ang.).