Katalin, Harangus, Kakucs Andras, and Galfi Botond Pal. “PLANE STATE PROBLEM ANALYSIS WITH FINITE-DIFFERENCE METHOD”. European Scientific Journal, ESJ 9, no. 21 (July 12, 2013). Accessed February 9, 2026. https://eujournal.org/index.php/esj/article/view/1442.