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@article{CMH_1937__10_138692, author = {Walter Gruner}, title = {Regul\"are {Permutationen} und ihre {Beziehungen} zur {Topologie.}}, journal = {Commentarii mathematici Helvetici}, pages = {42--68}, publisher = {mathdoc}, volume = {10}, year = {1937}, zbl = {0017.29702}, url = {http://geodesic.mathdoc.fr/item/CMH_1937__10_138692/} }
Walter Gruner. Reguläre Permutationen und ihre Beziehungen zur Topologie.. Commentarii mathematici Helvetici, Tome 10 (1937), pp. 42-68. http://geodesic.mathdoc.fr/item/CMH_1937__10_138692/