On the Space of Maps of a Closed Surface into the 2-Sphere.
Mathematica Scandinavica, Tome 35 (1974), pp. 149-158.

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     author = {Vagn Lundsgaard Hansen},
     title = {On the {Space} of {Maps} of a {Closed} {Surface} into the {2-Sphere.}},
     journal = {Mathematica Scandinavica},
     pages = {149--158},
     publisher = {mathdoc},
     volume = {35},
     year = {1974},
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     url = {http://geodesic.mathdoc.fr/item/MS2_1974__35_166381/}
}
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Vagn Lundsgaard Hansen. On the Space of Maps of a Closed Surface into the 2-Sphere.. Mathematica Scandinavica, Tome 35 (1974), pp. 149-158. http://geodesic.mathdoc.fr/item/MS2_1974__35_166381/