@inproceedings{LICS-2009-Tan,
	author        = "Tony Tan",
	booktitle     = "{Proceedings of the 24th Annual IEEE Symposium on Logic in Computer Science}",
	doi           = "10.1109/LICS.2009.23",
	isbn          = "978-0-7695-3746-7",
	pages         = "157--166",
	publisher     = "{IEEE Computer Society}",
	title         = "{Graph Reachability and Pebble Automata over Infinite Alphabets}",
	year          = 2009,
}