On the Space of Maps of a Closed Surface into the 2-Sphere.
Hansen, Vagn Lundsgaard
Mathematica Scandinavica, Tome 34 (1974), p. 149-158 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1974-01-01
EUDML-ID : urn:eudml:doc:166381 
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     title = {On the Space of Maps of a Closed Surface into the 2-Sphere.},
     journal = {Mathematica Scandinavica},
     volume = {34},
     year = {1974},
     pages = {149-158},
     zbl = {0299.55017},
     url = {http://dml.mathdoc.fr/item/GDZPPN002352923}
}

Hansen, Vagn Lundsgaard. On the Space of Maps of a Closed Surface into the 2-Sphere.. Mathematica Scandinavica, Tome 34 (1974) pp. 149-158. http://gdmltest.u-ga.fr/item/GDZPPN002352923/