@article{MAN_1929__101_159332,
     author = {D. Sintzow},
     title = {Zur {Kr\"ummungstheorie} der {Integralkurven} der {Pfaffschen} {Gleichung.}},
     journal = {Mathematische Annalen},
     pages = {261--272},
     publisher = {mathdoc},
     volume = {101},
     year = {1929},
     zbl = {55.0402.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1929__101_159332/}
}