Tamasyan, G.Sh. “Methods of Steepest and Hypodifferential Descent in One Problem of Calculus of Variations”. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie) 13, no. 31 (February 27, 2012): 197–217. Accessed May 2, 2024. https://en.num-meth.ru/index.php/journal/article/view/512.