KRYLOVAS, Aleksandras. Asymptotic integration of systems of two wave equations with small parameter. Lietuvos matematikos rinkinys, [S. l.], v. 57, n. B, p. 31–36, 2016. DOI: 10.15388/LMR.B.2016.06. Disponível em: https://www.journals.vu.lt/LMR/article/view/17732.. Acesso em: 28 apr. 2024.