LI, . W.-N.; CUI, B.-T. FORCED OSCILLATIONS OF NONLINEAR HYPERBOLIC EQUATIONS WITH FUNCTIONAL ARGUMENTS. Tamkang Journal of Mathematics, [S. l.], v. 30, n. 2, p. 93–104, 1999. DOI: 10.5556/j.tkjm.30.1999.4212. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4212. Acesso em: 8 may. 2024.