GASIŃSKI, L.; PAPAGEORGIOU, N. Superlinear Robin problems with indefinite linear part. Science, Technology and Innovation, [S. l.], v. 2, n. 1, p. 74–94, 2018. DOI: 10.5604/01.3001.0012.0898. Disponível em: https://journals.anstar.edu.pl/index.php/sti/article/view/232. Acesso em: 3 jul. 2024.