@inproceedings{STOC-1970-Chang,
	author        = "Shi-Kuo Chang",
	booktitle     = "{Proceedings of the Second Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800161.805166",
	pages         = "206--216",
	publisher     = "{ACM}",
	title         = "{The Analysis of Two-Dimensional Patterns using Picture Processing Grammars}",
	year          = 1970,
}