The Seifert and Van Kampen theorem via regular covering spaces.
Knill, R. J.
Pacific J. Math., Tome 49 (1973) no. 2, p. 149-160 / Harvested from Project Euclid
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Publié le : 1973-05-14
Classification:  55A10 
@article{1102945276,
     author = {Knill, R. J.},
     title = {The Seifert and Van Kampen theorem via regular covering spaces.},
     journal = {Pacific J. Math.},
     volume = {49},
     number = {2},
     year = {1973},
     pages = { 149-160},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102945276}
}

Knill, R. J. The Seifert and Van Kampen theorem via regular covering spaces.. Pacific J. Math., Tome 49 (1973) no. 2, pp.  149-160. http://gdmltest.u-ga.fr/item/1102945276/