Dan Archdeacon. A note on defective colorings of graphs in surfaces. Journal of Graph Theory, 11(4):517-519, 1987. [doi]
@article{Archdeacon87,
title = {A note on defective colorings of graphs in surfaces},
author = {Dan Archdeacon},
year = {1987},
doi = {10.1002/jgt.3190110408},
url = {http://dx.doi.org/10.1002/jgt.3190110408},
researchr = {https://researchr.org/publication/Archdeacon87},
cites = {0},
citedby = {0},
journal = {Journal of Graph Theory},
volume = {11},
number = {4},
pages = {517-519},
}