Córcoles, J., M. A. González, and J. Rubio,  "Fourier Synthesis of Linear Arrays Based on the Generalized Scattering Matrix and Spherical Modes",  IEEE Transactions on Antennas and Propagation, vol. 57, no. 7, pp. 1944-1951, July, 2009.

Ruiz-Cruz, J. A., K. A. Zaki, and J. M. Rebollar,  "Mode-matching analysis of a coaxial-to-stripline discontinuity applied to the modeling of a coaxial probe",  Proc. 2004 IEEE Antennas and Propagation Society International Symposium, vol. 2, pp. 2139-2142, June, 2004.