NguyenThieu Huy, HaVu Thi Ngoc, and YenTrinh Xuan. “Admissible Integral Manifolds for Partial Neutral Functional-Differential Equations”. Ukrains’kyi Matematychnyi Zhurnal 74, no. 10 (November 27, 2022): 1364 - 1387. Accessed November 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/6257.