Gubareni, N. M., M. A. Dokuchaev, and V. V. Kirichenko. 2010. “Semiperfect Ipri-Rings and Right Bézout Rings”. Ukrains’kyi Matematychnyi Zhurnal 62 (5), 612–624. https://umj.imath.kiev.ua/index.php/umj/article/view/2892.