Radim Belohlávek Lattices of Fixed Points of Fuzzy Galois Connections. 111-116 2001 47 Math. Log. Q. 1 http://dx.doi.org/10.1002/1521-3870(200101)47:1<111::AID-MALQ111>3.0.CO;2-A db/journals/mlq/mlq47.html#Blohlavek01