TY  - JOUR
AU  - Herbert Lange
TI  - Higher secant varieties of curves and the theorem of Nagata on ruled surfaces.
JO  - Manuscripta mathematica
PY  - 1984
SP  - 263
EP  - 270
VL  - 47
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MM2_1984__47_155015/
ID  - MM2_1984__47_155015
ER  -