@inproceedings{PPDP-2000-Faggian,
	author        = "Claudia Faggian",
	booktitle     = "{Proceedings of the Second International Conference on Principles and Practice of Declarative Programming}",
	doi           = "10.1145/351268.351278",
	pages         = "80--91",
	title         = "{Proof construction and non-commutativity: a cluster calculus}",
	year          = 2000,
}