@article{CMH_1934__7_138634,
     author = {W. Scherrer},
     title = {\"Uber die {Kr\"ummung} einer zweidimensionalen {Mannigfaltigkeit} im vierdimensionalen {Euklidischen} {Raum.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {150--157},
     publisher = {mathdoc},
     volume = {7},
     year = {1934},
     zbl = {0010.37502},
     url = {http://geodesic.mathdoc.fr/item/CMH_1934__7_138634/}
}