@article{MZ_1936__41_168679,
     author = {W. Blaschke},
     title = {Integralgeometrie 13. {Zur} {Kinematik}},
     journal = {Mathematische Zeitschrift},
     pages = {465--478},
     year = {1936},
     volume = {41},
     zbl = {0014.27406},
     url = {http://geodesic.mathdoc.fr/item/MZ_1936__41_168679/}
}