@article{MZ_1921__10_167638,
     author = {L., Berwald},
     title = {\"Uber affine {Geometrie} {XXX:} {Die} oskulierenden {Fl\"achen} zweiter {Ordnung} in der affinen {Fl\"achentheorie}},
     journal = {Mathematische Zeitschrift},
     pages = {160--172},
     publisher = {mathdoc},
     volume = {10},
     year = {1921},
     zbl = {48.0804.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1921__10_167638/}
}