@book{PPN58470691X, title = {Geometrie und Trigonometrie Abth. 2}, series = {GDML\_Books}, publisher = {Lampart}, address = {Augsburg}, year = {1851}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN58470691X} }
Wolkenstein-Rodenegg, Alexander. Geometrie und Trigonometrie Abth. 2. GDML_Books (1851), http://gdmltest.u-ga.fr/item/PPN58470691X/