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@article{MAN_1963__151_161071, author = {G. Burde}, title = {Zur {Theorie} der {Z\"opfe.}}, journal = {Mathematische Annalen}, pages = {101--107}, publisher = {mathdoc}, volume = {151}, year = {1963}, zbl = {0112.38604}, url = {http://geodesic.mathdoc.fr/item/MAN_1963__151_161071/} }
G. Burde. Zur Theorie der Zöpfe.. Mathematische Annalen, Tome 151 (1963), pp. 101-107. http://geodesic.mathdoc.fr/item/MAN_1963__151_161071/