Barnard R, Stiele H, Hatzidimitriou D, Kong AKH, Williams BF, Pietsch W, Kolb UC, Haberl F, Sala G. New XMM-Newton Analysis of Three Bright X-Ray Sources in M31 Globular Clusters, Including a New Black Hole Candidate.  [Internet]. 2008;689:1215 - 1221.