@book{grundriss+der+differential+und+integral+rechnung+t+1+differential+rechnung,
    author = {Stegemann, Max},
    title = {Grundriss der Differential- und Integral-Rechnung. T. 1, Differential-Rechnung},
    address = {Hannover},
    publisher = {Helwing'sche Verlagsbuchhandlung},
    date = {1892}
}