On a theorem of H. Hopf.
Sakkalis, Takis
International Journal of Mathematics and Mathematical Sciences, Tome 13 (1990), p. 813-816 / Harvested from The Electronic Library of Mathematics
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Publié le : 1990-01-01
DOI : https://doi.org/10.1155/S0161171290001132
EUDML-ID : urn:eudml:doc:46580 
@article{04192691,
     title = {On a theorem of H. Hopf.},
     journal = {International Journal of Mathematics and Mathematical Sciences},
     volume = {13},
     year = {1990},
     pages = {813-816},
     doi = {10.1155/S0161171290001132},
     zbl = {0723.58011},
     language = {en},
     url = {http://dml.mathdoc.fr/item/04192691}
}

Sakkalis, Takis. On a theorem of H. Hopf.. International Journal of Mathematics and Mathematical Sciences, Tome 13 (1990) pp. 813-816. doi : 10.1155/S0161171290001132. http://gdmltest.u-ga.fr/item/04192691/