TY  - JOUR
AU  - Berman, David M.
TI  - Critical Graphs for Acyclic Colorings
JO  - Canadian mathematical bulletin
PY  - 1978
SP  - 115
EP  - 116
VL  - 21
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1978-018-x/
DO  - 10.4153/CMB-1978-018-x
ID  - 10_4153_CMB_1978_018_x
ER  -