@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/}
}