Topikyan, G.M. “EXPLICIT FACTORIZATION OF A $(P,Q)$-CIRCULANT MATRIX-FUNCTIONS”. Proceedings of the YSU A: Physical and Mathematical Sciences 45, no. 3 (226) (October 17, 2011): 23–30. Accessed September 20, 2024. https://pub.ysu.am/index.php/proceedings-phys-math/article/view/vol45_no3_2011_pp023-030.