Zhang, Y., J. A. Ruiz-Cruz, K. A. Zaki, and A. J. Piloto,  "A Waveguide to Microstrip Inline Transition With Very Simple Modular Assembly",  IEEE Microwave and Wireless Components Letters, vol. 20, no. 9, pp. 480-482, Sept., 2010.

Ruiz-Cruz, J. A., J. R. Montejo-Garai, J. M. Rebollar, and K. A. Zaki,  "Waveguide filters with elliptical function response: Overview and results of different implementations",  International Journal of RF and Microwave Computer-Aided Engineering, vol. 17, no. 1, pp. 63-69, Jan., 2007.