BOUTERAA N, BENAICHA S. A study of existence and multiplicity of positive solutions for nonlinear fractional differential equations with nonlocal boundary conditions. Stud. Univ. Babeş-Bolyai Math. [Internet]. 2021 Jun. 30 [cited 2025 Feb. 5];66(2):361–380. Available from: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/1334