1.
Wei Y, Shang S, Bai Z. Applications of variational methods to some three-point boundary value problems with instantaneous and noninstantaneous impulses. NAMC [Internet]. 2022 Feb. 4 [cited 2024 May 6];27(3):466-78. Available from: https://www.journals.vu.lt/nonlinear-analysis/article/view/26253