ZADA, A.; YAR, M.; LI, T. Existence and stability analysis of nonlinear sequential coupled system of Caputo fractional differential equations with integral boundary conditions. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 17, p. 103–125, 2019. Disponível em: https://studmath.uken.krakow.pl/article/view/12964. Acesso em: 21 jul. 2026.