TY  - JOUR
AU  - D. S. Malyshev
TI  - On the number of boundary classes in the 3-colouring problem
JO  - Diskretnaya Matematika
PY  - 2009
SP  - 129
EP  - 134
VL  - 21
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DM_2009_21_4_a10/
LA  - ru
ID  - DM_2009_21_4_a10
ER  -