Georgieva, Magdalena. β€œON SOME OUTPUT PROCESSES IN THE SYSTEMS \(M G 1\) AND \(M^X G 1\)”. Matematichki Bilten 17, no. 1 (January 1, 1993): 109–117. Accessed August 14, 2026. https://bilten.smm.org.mk/index.php/bilten/article/view/1506.