Subdirectly dominated semigroup varieties M. DemlováV. Koubek OriginalPaper 01 December 1997 Pages: 15 - 35
Binary operations suffice to test collapsing of monoidal intervals J.-U. Grabowski OriginalPaper 01 December 1997 Pages: 92 - 95
Derived varieties of semigroups and groupoids D. SchweigertS. L Wismath OriginalPaper 01 December 1997 Pages: 36 - 55
(Finitely) subdirectly irreducibles and Birkhoff-like sheaf representation for certain varieties of lattice ordered structures H. GramagliaD.J Vaggione OriginalPaper 01 December 1997 Pages: 56 - 91