1990/37/1-2 (4) — DOI: 10.5486/PMD.1990.37.1-2.04 — pp. 25-31
Full Text Abstract

Some remarks on the twelfth problem of Hanna Neumann

Authors: Krzysztof Herman

Keywords: -

Mathematics Subject Classification: 20E10, 20F05, 20F14, 20F18