YOON LEE, Dong. The variation of propagation velocity according to substrate material of band pass filter. International Journal of Engineering and Technology, [S. l.], v. 7, n. 2.33, p. 393–396, 2018. DOI: 10.14419/ijet.v7i2.33.14193. Disponível em: https://mail.sciencepubco.com/index.php/IJET/article/view/14193.. Acesso em: 13 may. 2025.