Fuzzy Sets and Systems
Fuzzy Sets and Systems > 1998 > 94 > 1 > 133-144
Fuzzy Sets and Systems > 1998 > 95 > 2 > 147-160
Fuzzy Sets and Systems > 1998 > 96 > 3 > 307-334
Fuzzy Sets and Systems > 1998 > 97 > 2 > 169-182
Fuzzy Sets and Systems > 1998 > 99 > 3 > 253-264
Fuzzy Sets and Systems > 1998 > 100 > 1-3 > 89-99