Hempel, John; Jaco, William Fundamental groups of 3-manifolds which are extensions. (English) Zbl 0226.57003 Ann. Math. (2) 95, 86-98 (1972). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 15 Documents MSC: 57M05 Fundamental group, presentations, free differential calculus PDF BibTeX XML Cite \textit{J. Hempel} and \textit{W. Jaco}, Ann. Math. (2) 95, 86--98 (1972; Zbl 0226.57003) Full Text: DOI