@article{QAPL-2004-Lluch-LafuenteM05,
	author        = "Alberto Lluch-Lafuente and Ugo Montanari",
	doi           = "10.1016/j.entcs.2004.02.063",
	journal       = "{Electronic Notes in Theoretical Computer Science}",
	pages         = "37--59",
	title         = "{Quantitative ?-calculus and CTL Based on Constraint Semirings}",
	volume        = 112,
	year          = 2005,
}