TY  - JOUR
AU  - Roitberg, Joseph
TI  - The product formula for Lusternik–Schnirelmann category
JO  - Algebraic and Geometric Topology
PY  - 2001
SP  - 491
EP  - 502
VL  - 1
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.2140/agt.2001.1.491/
DO  - 10.2140/agt.2001.1.491
ID  - 10_2140_agt_2001_1_491
ER  -