List-colouring the square of a K4-minor-free graph

@article{Hetherington2008ListcolouringTS,
title={List-colouring the square of a K4-minor-free graph},
author={Timothy J. Hetherington and Douglas R. Woodall},
journal={Discrete Mathematics},
year={2008},
volume={308},
pages={4037-4043}
}