POSTNIKOV, A. G. Generalization of one of the Hilbert Problems. The Journal of the Indian Mathematical Society, [S. l.], v. 20, n. 1-3, p. 207–216, 1956. DOI: 10.18311/jims/1956/16990. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/16990. Acesso em: 28 apr. 2024.