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The Seifert-van Kampen theorem and generalized free products of |
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| Authors: | Roland Schwä nzl Ross Staffeldt |
| Affiliation: | Fachbereich Mathematik/Informatik, Universität Osnabrück, 46069 Osnabrück, Federal Republic of Germany ; Department of Mathematical Sciences, New Mexico State University, Las Cruces, New Mexico 88003 |
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