1.
Velikoivanenko IM, Lyashko II, Mistetsky GE. Solution in finite-difference stating of boundary value problems for one equation of elliptical type. Ukr. Mat. Zhurn. [Internet]. 1971Feb.23 [cited 2024Nov.24];23(2):229-35. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8505