@book{PPN589855506, title = {Methode der kleinsten Quadrate. - Fehlertheoretische Untersuchungen Bd. 2}, series = {GDML\_Books}, publisher = {D\"ummler}, address = {Berlin}, year = {1888}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN589855506} }
Encke, Johann Franz. Methode der kleinsten Quadrate. - Fehlertheoretische Untersuchungen Bd. 2. GDML_Books (1888), http://gdmltest.u-ga.fr/item/PPN589855506/