@book{PPN593814932, title = {Lehrbuch der analytischen Curventheorie Teil 1}, series = {GDML\_Books}, publisher = {Koch}, year = {1880}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN593814932} }
Hoppe, Reinhold. Lehrbuch der analytischen Curventheorie Teil 1. GDML_Books (1880), http://gdmltest.u-ga.fr/item/PPN593814932/