K. C., R.; ALAM M., S. Effect of higher approximation of Krylov-Bogoliubov-Mitropolskii’s solution and matched asymptotic solution of a differential system with slowly varying coefficients and damping near to a turning point. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 26, n. 3, p. 182–192, 2004. DOI: 10.15625/0866-7136/26/3/5702. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/5702. Acesso em: 30 nov. 2021.