Brsakoska, Slagjana, and Aleksa Malcheski. “SPACE OF SOLUTIONS OF LINEAR DIFFERENTIAL EQUATION OF SECOND ORDER AS 2-NORMED SPACE”. Balkan Journal of Applied Mathematics and Informatics 4, no. 2 (December 23, 2021): 83-90. Accessed July 22, 2024. https://js.ugd.edu.mk/index.php/bjami/article/view/4272.