TUDORACHE, Alexandru; LUCA, Rodica. Positive solutions to a system of psi-Riemann–Liouville fractional differential equations with coupled boundary conditions. Nonlinear Analysis: Modelling and Control, [S. l.], v. 31, p. 1–24, 2026. DOI: 10.15388/namc.2026.31.47756. Disponível em: https://www.journals.vu.lt/nonlinear-analysis/article/view/47756. Acesso em: 7 aug. 2026.