Nikmehr, M. J. “Strongly Semicommutative Rings Relative to a Monoid”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 11 (November 25, 2014): 1528–1539. Accessed April 20, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2243.