 Before we do so, it should be noted that LSD had some influence on the development of intensional logic. Both Kaplan (1964) and Montague (1969, 1970b) built on Church’s work, combining type theory with Carnap’s (1947) notion of an intension as a function from worlds to extensions. However, to the extent that Kaplan and Montague favored Carnap’s notion of an intension they disagreed with Church himself, who rejected this notion and treated senses along the same lines as Frege (again, see  supplement E).  Anderson (1980, 1987, 2001), Klement (2002), T. Parsons (2001) and Salmón (2010) follow Frege and Church more closely. Bealer (1982) also responded to Church. (See also the entry on  intensional logic.)