Gusynin, Viacheslav, Andrii Gusynin, and Helen Tachinina. “ESTIMATE OF ACCURACY OF APPROXIMATE SOLUTIONS OF NON-LINEAR BOUNDARY VALUE PROBLEMS BY THE MULTI-STEP DIFFERENTIAL TRANSFORM METHOD”. Proceedings of National Aviation University (archive) 70, no. 1 (April 28, 2017): 48–54. Accessed June 13, 2026. http://jrnl.kai.edu.ua/index.php/visnik/article/view/11422.