@inproceedings{DLT-1997-Kuich97a,
	author        = "Werner Kuich",
	booktitle     = "{Proceedings of the Third International Conference on Developments in Language Theory}",
	pages         = "61--101",
	publisher     = "{Aristotle University of Thessaloniki}",
	title         = "{Formal Power Series over Trees}",
	year          = 1997,
}