U. Author, “O NEKIM KVALITATIVNIM OSOBINAMA REŠENJA JEDNAČINE ф(x,y,y’,y)=0”, Mat. Bilt., vol. 28, no. 1, Jan. 1978, Accessed: Jun. 13, 2026. [Online]. Available: https://bilten.smm.org.mk/index.php/bilten/article/view/1411