@inproceedings{FoSSaCS-2003-CardelliGG,
	author        = "Luca Cardelli and Philippa Gardner and Giorgio Ghelli",
	booktitle     = "{Proceedings of the Sixth International Conference on Foundations of Software Science and Computation Structures}",
	doi           = "10.1007/3-540-36576-1_14",
	isbn          = "3-540-00897-7",
	pages         = "216--232",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Manipulating Trees with Hidden Labels}",
	volume        = 2620,
	year          = 2003,
}