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Fuzzy Information and Engineering > 2012 > 4 > 2 > 123-143
Fuzzy Sets and Systems > 1997 > 89 > 2 > 263-266
Fuzzy Sets and Systems > 1997 > 87 > 2 > 243-249
Fuzzy Information and Engineering > 2012 > 4 > 2 > 123-143
Fuzzy Sets and Systems > 1997 > 89 > 2 > 263-266
Fuzzy Sets and Systems > 1997 > 87 > 2 > 243-249