 The paradox of the knower is just one of many epistemic paradoxes involving self-reference. See the entry on  epistemic paradoxes  for further information on the class of epistemic paradoxes. A quite recent epistemic paradox, cast in the setting of beliefs and assumptions in a two-player game, is the Brandenburger-Keisler paradox (Brandenburger &amp; Keisler, 2006), described in detail in the entry on  epistemic foundations of game theory.  For a detailed discussion and history of the paradoxes of self-reference in general, see the entry on  paradoxes and contemporary logic.  