@article{GDZPPN00238003X,
title = {Differentialgeometrie des isotropen Raumes. III Fl\"achentheorie},
journal = {Mathematische Zeitschrift},
volume = {48},
year = {1942},
pages = {369-427},
zbl = {68.0440.01},
url = {http://dml.mathdoc.fr/item/GDZPPN00238003X}
}
Strubecker, K. Differentialgeometrie des isotropen Raumes. III Flächentheorie. Mathematische Zeitschrift, Tome 48 (1942) pp. 369-427. http://gdmltest.u-ga.fr/item/GDZPPN00238003X/