Karrass, A.; Solitar, D. Subgroups of HNN groups and groups with one defining relation. (English) Zbl 0232.20051 Can. J. Math. 23, 627-643 (1971). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 3 ReviewsCited in 53 Documents MSC: 20E06 Free products of groups, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations 20E07 Subgroup theorems; subgroup growth 20F05 Generators, relations, and presentations of groups PDFBibTeX XMLCite \textit{A. Karrass} and \textit{D. Solitar}, Can. J. Math. 23, 627--643 (1971; Zbl 0232.20051) Full Text: DOI