VasylykV. B., and MakarovV. L. “Exponentially Convergent Method for an Abstract Nonlocal Problem With Integral Nonlinearity”. Ukrains’kyi Matematychnyi Zhurnal 68, no. 12 (December 25, 2016): 1587-1597. Accessed December 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1945.