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Gallery of Mathematics / Self-referential Sentences
Produced by Andy Burbanks. Good explanation with examples.
http://info.lut.ac.uk/departments/ma/gallery/selfref/index.h tml

Solve my base three numerical self-referential sentences puz zle!
The object of this difficult puzzle is to make four sentences mutually truthful by filling in base three numbers.
http://www.olympus.net/personal/dewey/puzzle.html