DR. VASILE POSTOLICA. A Survey on Theoretical and Applied Mathematics under the Efficiency. Global Journal of Science Frontier Research, [S. l.], v. 10, n. 7, p. -, 2010. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/205. Acesso em: 6 may. 2024.