@book{PPN590099280,
title = {F\"ur mittlere Klassen H. 1},
series = {GDML\_Books},
publisher = {Stein},
address = {Potsdam},
year = {1883},
language = {de},
url = {http://dml.mathdoc.fr/item/PPN590099280}
}
Schubert, Hermann. Für mittlere Klassen H. 1. GDML_Books (1883), http://gdmltest.u-ga.fr/item/PPN590099280/