Tzung-Pei Hong Chun-Wei Lin 0001 Tsung-Ching Lin Shing-Tai Pan Upper-bound multiple fuzzy frequent-pattern trees. 218-222 2011 FUZZ-IEEE https://doi.org/10.1109/FUZZY.2011.6007678 conf/fuzzIEEE/2011 db/conf/fuzzIEEE/fuzzIEEE2011.html#HongLLP11