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@article{MAN_1886__27_157203, author = {Engel}, title = {Ueber die {Definitionsgleichungen} der continuirlichen {Transformationsgruppen}}, journal = {Mathematische Annalen}, pages = {1--57}, publisher = {mathdoc}, volume = {27}, year = {1886}, zbl = {18.0317.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1886__27_157203/} }
Engel. Ueber die Definitionsgleichungen der continuirlichen Transformationsgruppen. Mathematische Annalen, Tome 27 (1886), pp. 1-57. http://geodesic.mathdoc.fr/item/MAN_1886__27_157203/