Gabrel’O. M. and MulyavkaO. H. (2003) “Approximate Solution of the de la Vallée Poussin Problem for a Differential Equation of Neutral Type by the Projection-Iterative Method”, Ukrains’kyi Matematychnyi Zhurnal, 55(2), pp. 278-283. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3905 (Accessed: 6October2024).