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@article{MAN_1927__97_182645, author = {O. M\"uhlendyck}, title = {Beitrag zur {Differentialgeometrie} der regul\"aren {Somenkongruenzen}}, journal = {Mathematische Annalen}, pages = {419--429}, publisher = {mathdoc}, volume = {97}, year = {1927}, zbl = {53.0706.05}, url = {http://geodesic.mathdoc.fr/item/MAN_1927__97_182645/} }
O. Mühlendyck. Beitrag zur Differentialgeometrie der regulären Somenkongruenzen. Mathematische Annalen, Tome 97 (1927), pp. 419-429. http://geodesic.mathdoc.fr/item/MAN_1927__97_182645/