@article{MAN_1937__114_159915,
     author = {P. Cacridis-Theodorakopulos},
     title = {\"Uber die {Kr\"ummung} der {Niveaukurven} der beschr\"ankten {Funktionen}},
     journal = {Mathematische Annalen},
     pages = {275--283},
     publisher = {mathdoc},
     volume = {114},
     year = {1937},
     zbl = {63.0287.03},
     url = {http://geodesic.mathdoc.fr/item/MAN_1937__114_159915/}
}