@book{PPN592509354, title = {Ebene und sph\"arische Trigonometrie Theil 3}, series = {GDML\_Books}, publisher = {Hirt}, address = {Breslau}, year = {1874}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN592509354} }
Kambly, Ludwig. Ebene und sphärische Trigonometrie Theil 3. GDML_Books (1874), http://gdmltest.u-ga.fr/item/PPN592509354/