ArticleFree Bases for Normal Subgroups of Free GroupsD. E. Cohen·R. C. Lyndon·1963·enABIABI:AkademIndex/openalex/2026.other.672998CiteAbstractNo abstract available.IdentifiersDOI10.2307/1993597Citations and referencesCited by 20 referencesMetrics — AkademScholar