@article{verdú2009,
	title     = {Logics preserving degrees of truth from varieties of residuated lattices},
	author    = {F. Bou and  F. Esteva and  J. M. Font and  A. Gil and  L. Godo and  A. Torrens and   V. Verdú},
	year      = {2009},
	journal   = {Journal of Logic and Computation},
	volume    = {19},
	number    = {6},
	pages     = {1031--1069},
	state     = {published}
}