Pseudo-BL algebras and pseudo-effect algebras.

Xiao-Hong Zhang Xue-Shuang Fan Pseudo-BL algebras and pseudo-effect algebras. 95-106 2008 159 Fuzzy Sets and Systems 1 http://dx.doi.org/10.1016/j.fss.2007.08.006 db/journals/fss/fss159.html#ZhangF08