On the Homeotopy Groups of Surfaces.
Mathematische Annalen, Tome 206 (1973), p. 1.

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Classification : 57N05, 57M05, 57M10, 57M20, 30F35 
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     author = {Heiner Zieschang},
     title = {On the {Homeotopy} {Groups} of {Surfaces.}},
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     year = {1973},
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Heiner Zieschang. On the Homeotopy Groups of Surfaces.. Mathematische Annalen, Tome 206 (1973), p. 1. https://geodesic-test.mathdoc.fr/item/MAN_1973__206_162503/