@article{PPN590099280+DMDLOG_0002, title = {Vorwort.}, booktitle = {F\"ur mittlere Klassen H. 1}, series = {GDML\_Books}, publisher = {Stein}, address = {Potsdam}, year = {1883}, pages = {III}, url = {http://dml.mathdoc.fr/item/PPN590099280+DMDLOG_0002} }
(éd.). Vorwort., dans Für mittlere Klassen H. 1, GDML_Books, (1883), p. III. http://gdmltest.u-ga.fr/item/PPN590099280+DMDLOG_0002/