A topological proof of Grushko's theorem on free products.
Mathematische Zeitschrift, Tome 90 (1965), pp. 1-8.

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Mots-clés : group theory
@article{MZ_1965__90_170458,
     author = {John R. Stallings},
     title = {A topological proof of {Grushko's} theorem on free products.},
     journal = {Mathematische Zeitschrift},
     pages = {1--8},
     publisher = {mathdoc},
     volume = {90},
     year = {1965},
     zbl = {0135.04603},
     url = {http://geodesic.mathdoc.fr/item/MZ_1965__90_170458/}
}
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John R. Stallings. A topological proof of Grushko's theorem on free products.. Mathematische Zeitschrift, Tome 90 (1965), pp. 1-8. http://geodesic.mathdoc.fr/item/MZ_1965__90_170458/