Ruelas-Mayorga, A., L. J. Sánchez, G. Herrera, and A. Nigoche-Netro. “CCD Photometry of M15”. Revista Mexicana de Astronomía y Astrofísica 46, no. 1 (January 11, 2016). Accessed April 20, 2024. https://journals.unam.mx/index.php/revmexaa/article/view/23596.