GRITSANS, Armands; SADYRBAEV, Felix. Nonlinear problems with asymmetric principal part. Mathematical Modelling and Analysis, [S. l.], v. 17, n. 2, p. 217–226, 2012. DOI: 10.3846/13926292.2012.661697. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/4858. Acesso em: 9 may. 2025.