GADYLSHIN, K.; PROTASOV, M. Calculation of exact frequency-dependent rays when the solution of the Helmholtz equation is known. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie), [S. l.], v. 16, n. 46, p. 586–594, 2015. DOI: 10.26089/NumMet.v16r455. Disponível em: https://en.num-meth.ru/index.php/journal/article/view/861. Acesso em: 20 apr. 2024.