SłowikR. “Expressing Infinite Matrices As Sums of Idempotents”. Ukrains’kyi Matematychnyi Zhurnal 69, no. 8 (August 25, 2017): 1145-1147. Accessed December 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1765.