1. Groups and nts languages;Journal of Computer and System Sciences;1987-10
2. Groups, the Theory of ends, and context-free languages;Journal of Computer and System Sciences;1983-06
3. Finite and infinite cyclic extensions of free groups;Journal of the Australian Mathematical Society;1973-12
4. On locally extended residually finite groups;Conference on Group Theory;1973
5. General theory of groups;Journal of Soviet Mathematics;1973