@article{MAN_1921__84_158880,
     author = {C. Siegel},
     title = {\"Uber {N\"aherungswerte} algebraischer {Zahlen.}},
     journal = {Mathematische Annalen},
     pages = {80--99},
     year = {1921},
     volume = {84},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1921__84_158880/}
}