@book{PPN60229813X, title = {Geometria Elementaris Pars 1}, series = {GDML\_Books}, publisher = {Trattner}, address = {Vindobonae}, year = {1770}, language = {la}, url = {http://dml.mathdoc.fr/item/PPN60229813X} }
Scherffer, Karl. Geometria Elementaris Pars 1. GDML_Books (1770), http://gdmltest.u-ga.fr/item/PPN60229813X/