 For more detailed treatments of these topics, see Gupta 1988/89, Gupta and Belnap 1993, and Chapuis and Gupta 1999. See also the entry on the  revision theory of truth.  For critical discussions of the revision theory, see the papers by Vann McGee and Donald A. Martin, and the reply by Gupta, in Villanueva 1997. See also Shapiro 2006.