IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol. 46, no. 4, page. 866 - 868, 1999-08
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol. 46, no. 2, page. 309 - 318, 1999-04
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol. 45, no. 5, page. 752 - 760, 1998-10