PHAM, N. S.; PHAM, T. T. . Surveying the flat circuits at high frequencies with FWM and FDTD. Journal of Technical Education Science, [S. l.], v. 5, n. 4, p. 51–57, 2010. Disponível em: https://www.jte.edu.vn/index.php/jte/article/view/784. Acesso em: 7 apr. 2026.