Dong, L. H., H. Y. Li, and T. S. Ma. “A Class of Double Crossed Biproducts”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 11 (November 25, 2018): 1533-1540. Accessed April 26, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1657.