Samadi A, Ntouyas SK, Tariboon J. On a (k;chi)-Hilfer fractional system with coupled nonlocal boundary conditions including various fractional derivatives and Riemann–Stieltjes integrals. NAMC [Internet]. 2024 May 1 [cited 2025 Jun. 15];29(3):426-48. Available from: https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/34531