EfendievV. V. and ZheltikovV. P. (1994) “Boundary-layer averaging for standard systems with lag”, Ukrains’kyi Matematychnyi Zhurnal, 46(10), pp. 1362–1368. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5614 (Accessed: 27July2024).