GRITSANS, Armands; SADYRBAEV, Felix. On nonlinear fučik type spectra. Mathematical Modelling and Analysis, [S. l.], v. 13, n. 2, p. 203–210, 2008. DOI: 10.3846/1392-6292.2008.13.203-210. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/7003. Acesso em: 17 may. 2025.