MITROPOLSKY, Y. A. Construction of asymptotic in Krylov-Bogoliubov-Mitropolsky sense solution of wave equations. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 29, n. 3, p. 221–243, 2007. DOI: 10.15625/0866-7136/29/3/5534. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/5534. Acesso em: 7 may. 2024.