On the van Kampen theorem.
Crowell, Richard H.
Pacific J. Math., Tome 9 (1959) no. 4, p. 43-50 / Harvested from Project Euclid
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Publié le : 1959-05-14
Classification:  55.00 
@article{1103039451,
     author = {Crowell, Richard H.},
     title = {On the van Kampen theorem.},
     journal = {Pacific J. Math.},
     volume = {9},
     number = {4},
     year = {1959},
     pages = { 43-50},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1103039451}
}

Crowell, Richard H. On the van Kampen theorem.. Pacific J. Math., Tome 9 (1959) no. 4, pp.  43-50. http://gdmltest.u-ga.fr/item/1103039451/