R.M. Wojciechowski, A. Demenko & J.K. Sykulski,
2010, COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 29(4), 908-918
Igor O. Golosnoy & Jan K. Sykulski,
2010, COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 29(4), 1047-1059