Gabrel' OM, Mulyavka OH. Approximate Solution of the de la Vallée Poussin Problem for a Differential Equation of Neutral Type by the Projection-Iterative Method. Ukr. Mat. Zhurn. [Internet]. 2003 Feb. 25 [cited 2025 Dec. 6];55(2):278-83. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3905