Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1921__10_167639, author = {C., Siegel}, title = {Approximation algebraischer {Zahlen}}, journal = {Mathematische Zeitschrift}, pages = {173--213}, publisher = {mathdoc}, volume = {10}, year = {1921}, zbl = {48.0163.07}, url = {http://geodesic.mathdoc.fr/item/MZ_1921__10_167639/} }
C., Siegel. Approximation algebraischer Zahlen. Mathematische Zeitschrift, Tome 10 (1921), pp. 173-213. http://geodesic.mathdoc.fr/item/MZ_1921__10_167639/