BVR photometry and H spectroscopy of RS CVn type binary MM HerculisG. Taş, S. Evren, G. Marino, A. Frasca, C. İbanoǧlu and S. CatalanoA&A, 376 3 (2001) 966-977DOI: https://doi.org/10.1051/0004-6361:20011010
spectroscopy of RS CVn type binary MM Herculis spectroscopy of RS CVn type binary MM Herculis