Maria Bernadete Zanusso Aldrovando L. A. Araújo CALIBRA for Fuzzy Concepts. 130-134 1998 conf/sbrn/1998 SBRN http://doi.ieeecomputersociety.org/10.1109/SBRN.1998.731009 db/conf/sbrn/sbrn1998.html#ZanussoA98