Wijayanti, I. E., M. Ardiyansyah, and P. W. Prasetyo. “On a Class of $\lambda$ -Modules”. Ukrains’kyi Matematychnyi Zhurnal 73, no. 3 (March 11, 2021): 329–334. Accessed April 7, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/513.