TY  - JOUR
AU  - F. TAKENS
TI  - The Minimal Number of Critical Points of a Function on a Compact Manifold and the Lusternik-Schnirelman Category.
JO  - Inventiones mathematicae
PY  - 1968
SP  - 197
EP  - 244
VL  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1968__6_141942/
ID  - IM_1968__6_141942
ER  -