@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/}
}