INTELLIGENT AUTOMATION AND SOFT COMPUTING, vol. 7, no. 4, page. 259 - 271, 2001-01
ISIJ INTERNATIONAL, vol. 42, no. 11, page. 1266 - 1272, 2002-01
FUZZY SETS AND SYSTEMS, vol. 130, no. 2, page. 175 - 188, 2002-09-01