BARNYAK, O. M. A projective method for the construction of solutions of the problem of normal symmetric oscillations of viscous liquid. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 2, p. 315–320, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5009. Acesso em: 6 dec. 2025.