On the expressive power of three-valued and four-valued languages. Avron, A. Journal of Logic and Computation, 9(6):977–994, 1999.
bibtex   
@Article{Av99,
		  author  = {Avron, A.},
		    title   = {On the expressive power of three-valued and four-valued languages},
			  journal = {Journal of Logic and Computation},
			    year    = {1999},
				  volume  = {9},
				    number  = {6},
					  pages   = {977--994},
}
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