TY  - JOUR
AU  - Dydak, Jerzy
AU  - Levin, Michael
TI  - Maps to the projective plane
JO  - Algebraic and Geometric Topology
PY  - 2009
SP  - 549
EP  - 568
VL  - 9
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.2140/agt.2009.9.549/
DO  - 10.2140/agt.2009.9.549
ID  - 10_2140_agt_2009_9_549
ER  -