@inproceedings{STOC-1996-RobertsonSST,
	author        = "Neil Robertson and Daniel P. Sanders and Paul D. Seymour and Robin Thomas",
	booktitle     = "{Proceedings of the 28th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/237814.238005",
	isbn          = "0-89791-785-5",
	pages         = "571--575",
	publisher     = "{ACM}",
	title         = "{Efficiently Four-Coloring Planar Graphs}",
	year          = 1996,
}