Minenko, A. S. “Investigation of One Convective Stefan Problem by the Ritz Method”.
Ukrains’kyi Matematychnyi Zhurnal
59, no. 11 (November 25, 2007): 1546–1556. Accessed April 11, 2025.
https://umj.imath.kiev.ua/index.php/umj/article/view/3410
.