Leal-Sevillano, C. A., J. R. Montejo-Garai, J. A. Ruiz-Cruz, and J. M. Rebollar,  "Low-Loss Elliptical Response Filter at 100 GHz",  Microwave and Wireless Components Letters, IEEE, vol. 22, no. 9, pp. 459 -461, September, 2012.

Ruiz-Cruz, J. A., Y. Zhang, J. R. Montejo-Garai, J. M. Rebollar, and K. A. Zaki,  "Longitudinal Dual-Mode Filters in Rectangular Waveguide",  2008 IEEE MTT-S International Microwave Symposium Digest, pp. 631-634, June, 2008.