Loo-Yau, J., O. Gómez-Pichardo, F. S, oval-Ibarra., M. Ma, a-Sánchez., J. Re, and noso-Hernández. “Spurline Structures and Its Application on Microwave Coupled Line Filter”. Revista Mexicana De Física, vol. 57, no. 3, Jan. 2011, pp. 184-0, https://rmf.smf.mx/ojs/index.php/rmf/article/view/3823.