TY  - JOUR
AU  - R.G. SWAN
TI  - Invariant Rational Functions and a Problem of Steenrod.
JO  - Inventiones mathematicae
PY  - 1969
SP  - 148
EP  - 158
VL  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1969__7_141959/
ID  - IM_1969__7_141959
ER  -