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@article{CMH_1981__56_139868, author = {Shing-Tung Yau and W.H. Meeks III}, title = {The equivariant {Dehn's} lemma and loop theorem.}, journal = {Commentarii mathematici Helvetici}, pages = {225--239}, publisher = {mathdoc}, volume = {56}, year = {1981}, zbl = {0469.57005}, url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139868/} }
Shing-Tung Yau; W.H. Meeks III. The equivariant Dehn's lemma and loop theorem.. Commentarii mathematici Helvetici, Tome 56 (1981), pp. 225-239. http://geodesic.mathdoc.fr/item/CMH_1981__56_139868/