Alexandros Chortaras Giorgos B. Stamou Andreas Stafylopatis Definition and Adaptation of Weighted Fuzzy Logic Programs. 85-135 2009 17 International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 1 http://dx.doi.org/10.1142/S0218488509005759 db/journals/ijufks/ijufks17.html#ChortarasSS09