@article{metcalfe,montagna2010,
	title     = {Algebraic and Proof-theoretic Characterizations of Truth Stressers for MTL and its Extensions},
	author    = {A. Ciabattoni and  G. Metcalfe and  and F. Montagna},
	year      = {2010},
	journal   = {Fuzzy Sets and Systems},
	volume    = {161},
	pages     = {369--389},
	publisher = {Elsevier},
	state     = {published}
}