On a Problem of Boone.
On a subclass of context-free groups
On Cancellations in HNN-Groups.
On group operations in groups of exponent k
On Some Classes Of Unrecognizable Properties Of Groups
On some classes of unrecognizable properties of groups.
On some presentations of completely regular semigroups.
On some systems of equations with constraints in a free group. – Addenda. (Sur certains systèmes d'équations avec constraintes dans un groupe libre. – Addenda.)
On some systems of equations with constraints in a free group. (Sur certains systèmes d'équations avec contraintes dans un groupe libre.)
On strictly sparse subsets of a free group.
On symmetric words in nilpotent groups.
On tame automorphisms of some metabelian groups.
On the Burnside problem for groups of even exponent.
On the Conjugacy Problem for Knot Groups.
On the dynamics and the fixed subgroup of a free group automorphism.
On the existence of universal rational structures for groups.
On Tits' conjecture and other questions concerning Artin and generalized Artin groups.
On universal theories of metabelian groups and the Shmel'kin embedding.