... York Ludwig, A. C. (1 968 ). Computation of radiation patterns involving numerical double integration, IEEE Trans. Antennas & Propagation, Vol. 16, No. 6, 767 - 769 , 0018-926X Ludwig, A. C. (1988). ... Propagat., Vol. 34, No .6, (June 19 86) 758– 766 , ISSN 0018-926X. Waterman, P. C. (2007). The T -matrix revisited. J. Opt. Soc. Am. A, Vol. 24, No. 8, (Aug. 2007) 2257-2 267 , ISSN 1084-7529. Xiao, ... (20 06) . Current and charge integral equation formulation. IEEE Trans. Antennas Propagat., Vol. 54, No. 1, (Jan. 20 06) 58 -67 , ISSN 0018-926X. Tiberi, G. A. Manara, M. G. & Mittra, R. (20 06) ....