@article {15962,
	title = {Languages with self-reference I: Foundations},
	journal = {Artificial Intelligence},
	volume = {25},
	year = {1985},
	month = {1985/03//},
	pages = {301 - 322},
	abstract = {It is argued that a proper treatment of cognitive notions such as beliefs and concepts should allow broad and consistent expression of syntax and semantics, and that this in turn depends on self-reference. A theory of quotation and unquotation is presented to this end that appears to make unnecessary the usual hierarchical and non-first-order constructions for these notions. In the current paper (Part I) the underlying theory is presented; a sequel will treat in more detail the applications to cognition.},
	isbn = {0004-3702},
	doi = {16/0004-3702(85)90075-X},
	url = {http://www.sciencedirect.com/science/article/pii/000437028590075X},
	author = {Perlis, Don}
}
