@book{PPN602298202, title = {Trigonometria Plana Pars 2}, series = {GDML\_Books}, publisher = {Trattner}, address = {Vindobonae}, year = {1770}, language = {la}, url = {http://dml.mathdoc.fr/item/PPN602298202} }
Scherffer, Karl. Trigonometria Plana Pars 2. GDML_Books (1770), http://gdmltest.u-ga.fr/item/PPN602298202/