PEROV, A.; KIBENKO, A. Theorem on the argument of the almost periodic function of many variables. Lithuanian Mathematical Journal, [S. l.], v. 7, n. 3, p. 505–508, 1967. DOI: 10.15388/LMJ.1967.19993. Disponível em: https://journals.vu.lt./LMJ/article/view/19993. Acesso em: 26 apr. 2025.