Ma, Jun; de Grijs, Richard; Fan, Zhou; Rey, Soo-Chang; Wu, Zhen-Yu; Zhou, Xu; Wu, Jiang-Hua; Jiang, Zhao-Ji; Chen, Jian-Sheng; Lee, Kyungsook; Sohn, Sangmo Tony. RESEARCH PAPER: Old stellar population synthesis: new age and mass estimates for Mayall II = G1. Research in Astronomy and Astrophysics. June 2009, 9 (6): 641–652. Bibcode:2009RAA.....9..641M. arXiv:0904.0674. doi:10.1088/1674-4527/9/6/003.
Ma, Jun; de Grijs, Richard; Fan, Zhou; Rey, Soo-Chang; Wu, Zhen-Yu; Zhou, Xu; Wu, Jiang-Hua; Jiang, Zhao-Ji; Chen, Jian-Sheng; Lee, Kyungsook; Sohn, Sangmo Tony. RESEARCH PAPER: Old stellar population synthesis: new age and mass estimates for Mayall II = G1. Research in Astronomy and Astrophysics. June 2009, 9 (6): 641–652. Bibcode:2009RAA.....9..641M. arXiv:0904.0674. doi:10.1088/1674-4527/9/6/003.
Ma, Jun; de Grijs, Richard; Fan, Zhou; Rey, Soo-Chang; Wu, Zhen-Yu; Zhou, Xu; Wu, Jiang-Hua; Jiang, Zhao-Ji; Chen, Jian-Sheng; Lee, Kyungsook; Sohn, Sangmo Tony. RESEARCH PAPER: Old stellar population synthesis: new age and mass estimates for Mayall II = G1. Research in Astronomy and Astrophysics. June 2009, 9 (6): 641–652. Bibcode:2009RAA.....9..641M. arXiv:0904.0674. doi:10.1088/1674-4527/9/6/003.