1. M. K. Bennett and D. J. Foulis, “Interval algebras and unsharp quantum logics,” preprint. University of Massachusetts, 1994.
2. T. S. Blyth and M. F. Janowitz,Residuation Theory (Pergamon, New York, 1972).
3. G. Cattaneo and G. Nistico, “Brouwer-Zadeh posets and three-valued Lukasiewicz posets,”Int. J. Fuzzy Sets Syst. 33, 165–190 (1989).
4. J. C. Derderian, “Residuated mappings,”Pacific J. Math. 20, 35–44 (1976).
5. D. J. Foulis, “A note on orthomodular lattices,”Portugaliae Mathematica 21, 65–72 (1962).