Ivanov, B.N. “Generation of Cycles of Map Cells for a Simple Planar Graph”. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie) 15, no. 40 (May 16, 2014): 304–316. Accessed April 20, 2024. https://en.num-meth.ru/index.php/journal/article/view/769.