@book{differentialgeometrie+1+raumkurven+und+anfaenge+der+flaechentheorie,
    author = {Rothe, Rudolf Ernst},
    title = {Differentialgeometrie. 1, Raumkurven und Anfänge der Flächentheorie},
    address = {Berlin i Leipzig},
    publisher = {Walter de Gruyter & Co.},
    date = {1937}
}