Jeongje Park Liang Wu Jaeseok Choi Junmin Cha Abdurrahim El-Keib Junzo Watada Fuzzy theory-based best generation mix considering renewable energy generators. 1462-1467 2009 FUZZ-IEEE https://doi.org/10.1109/FUZZY.2009.5277196 conf/fuzzIEEE/2009 db/conf/fuzzIEEE/fuzzIEEE2009.html#ParkWCCEW09