Daniel Ruiz-Aguilera Joan Torrens Distributivity of residual implications over conjunctive and disjunctive uninorms. 23-37 2007 158 Fuzzy Sets and Systems 1 http://dx.doi.org/10.1016/j.fss.2006.08.008 db/journals/fss/fss158.html#Ruiz-AguileraT07