FERENCZ, Cs. WAVE PROPAGATION IN INHOMOGENEOUS, ANISOTROPIC, TIME-VARYING MEDIUM Periodica Polytechnica Electrical Engineering, [S. l.], v. 12, n. 3, p. 347–355, 1968. Disponível em: https://pp.bme.hu/ee/article/view/5175. Acesso em: 15 may. 2024.