PetryshynY. R. (2000) “Averaging of a multipoint problem with parameters for an impulsive oscillation system”, Ukrains’kyi Matematychnyi Zhurnal, 52(3), pp. 419-423. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4433 (Accessed: 22November2024).