TY  - JOUR
AU  - Tutte, W. T.
TI  - Chromatic Sums for Rooted Planar Triangulations, III: The Case λ = 3
JO  - Canadian journal of mathematics
PY  - 1973
SP  - 780
EP  - 790
VL  - 25
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1973-080-7/
DO  - 10.4153/CJM-1973-080-7
ID  - 10_4153_CJM_1973_080_7
ER  -