@article{KUMEM_1927_2_a0,
     author = {W. Blaschke},
     title = {Beziehungen zwischen der {Differentialgeometrie} des $R_3$ und des~$R_4$},
     journal = {In memoriam N. I. Lobatschevskii},
     pages = {1--3},
     publisher = {mathdoc},
     volume = {2},
     year = {1927},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/KUMEM_1927_2_a0/}
}