TY  - JOUR
AU  - Patrick Labarque
TI  - Blueprint for a classic proof of the 4 colour theorem
JO  - Visual Mathematics
PY  - 2010
VL  - 12
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VM_2010_12_2_a2/
LA  - en
ID  - VM_2010_12_2_a2
ER  -