GASIŃSKI, Leszek; PAPAGEORGIOU, Nikolaos S. Multiple Solutions for Nonlinear Dirichlet Problems with Concave Terms. Mathematica Scandinavica, Berkeley, CA, United States, v. 113, n. 2, p. 206–247, 2013. DOI: 10.7146/math.scand.a-15570. Disponível em: https://journals.msp.org/mscand/article/view/439. Acesso em: 24 jul. 2026.