Residual ...-Centrality in Groups.
Semigroups satisfying xy = yg (x,y)x.
Some aspects of radical theory for fully ordered Abelian groups
Sur les monoïdes finis n'ayant que des sous-groupes triviaux
Symmetric words in nilpotent groups of class ≤ 3
Term functions on non-Abelian groups of order
The Baer-Invariant and the Direct Limit.
The Birkhoff-Neumann Embedding of Relatively Free Groups
The categories of free metabelian groups and Lie algebras
The endocenter and its applications to quasigroup representation theory
A construction is given, in a variety of groups, of a ``functorial center'' called the endocenter. The endocenter facilitates the identification of universal multiplication groups of groups in the variety, addressing the problem of determining when combinatorial multiplication groups are universal.
The finite basis problem in the pseudovariety joins of aperiodic semigroups with groups.
The groupoid of varieties of idempotent semigroups.
The structure of -free nilpotent groups of step 3.
The structure of the rings assigned to group varieties
The variety of topological groups generated by the free topological group on [0,1]
Topological dimensions for -groups.
Torsion radicals of lattice ordered groups
Two decidable Markov properties over a class of solvable groups.
Two problems on varieties of groups generated by wreath products.
Über minimale k-irreguläre p-Gruppen II