TY  - JOUR
AU  - Sun, Yingcai
AU  - Chen, Min
TI  - Acyclic 4-choosability of planar graphs without 4-cycles
JO  - Czechoslovak Mathematical Journal
PY  - 2020
SP  - 161
EP  - 178
VL  - 70
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.2019.0197-18/
DO  - 10.21136/CMJ.2019.0197-18
LA  - en
ID  - 10_21136_CMJ_2019_0197_18
ER  -