1.
Wang L, Zhang X, Lu X. Existence and uniqueness of solutions for a singular system of higher-order nonlinear fractional differential equations with integral boundary conditions. NAMC [Internet]. 2013 Oct. 25 [cited 2025 Jun. 16];18(4):493-518. Available from: https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/13975