@book{PPN547469128, title = {Das XVII. Jahrhundert Heft 2}, series = {GDML\_Books}, publisher = {Wyss}, address = {Bern}, year = {1889}, language = {ger}, url = {http://dml.mathdoc.fr/item/PPN547469128} }
Graf, Johann Heinrich. Das XVII. Jahrhundert Heft 2. GDML_Books (1889), http://gdmltest.u-ga.fr/item/PPN547469128/