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@article{MAN_1980__251_163433, author = {William E. Lang and Niels O. Nygaard}, title = {A {Short} {Proof} of the {Rydakov-Safarevic} {Theorem.}}, journal = {Mathematische Annalen}, pages = {171--174}, publisher = {mathdoc}, volume = {251}, year = {1980}, zbl = {0457.14018}, url = {http://geodesic.mathdoc.fr/item/MAN_1980__251_163433/} }
William E. Lang; Niels O. Nygaard. A Short Proof of the Rydakov-Safarevic Theorem.. Mathematische Annalen, Tome 251 (1980), pp. 171-174. http://geodesic.mathdoc.fr/item/MAN_1980__251_163433/