Collins Donald J

Publications in Math-Net.Ru

1. Combinatorial theory of groups, and fundamental groups
   
   Itogi Nauki i Tekhniki. Ser. Sovrem. Probl. Mat. Fund. Napr., 58 (1990),  5–190
2. A universal semigroup
   
   Algebra Logika, 9:6 (1970),  731–740