A theorem of E. Hopf.
Green, L. W.
Michigan Math. J., Tome 5 (1958) no. 1, p. 31-34 / Harvested from Project Euclid
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Publié le : 1958-05-14
Classification:  53.00 
@article{1028998009,
     author = {Green, L. W.},
     title = {A theorem of E. Hopf.},
     journal = {Michigan Math. J.},
     volume = {5},
     number = {1},
     year = {1958},
     pages = { 31-34},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1028998009}
}

Green, L. W. A theorem of E. Hopf.. Michigan Math. J., Tome 5 (1958) no. 1, pp.  31-34. http://gdmltest.u-ga.fr/item/1028998009/