DEMENTIEV , S. N.; YANOVSKY , L. P. Solubility of the nonlinear Valle Pussen problems . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 5, p. 700–703, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7968. Acesso em: 7 apr. 2025.