BELYAEV, A. V. Entire solutions of the euler—poisson equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 5, p. 677–686, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3787. Acesso em: 6 dec. 2025.