Works Cited

Twistor Theory

1) http://www.turing.org.uk/twistordiagrams/intro1.html

  This site is mounted by a physicist who is currently working

on an area in twistor theory.  The site is plain but accurate, 
and describes the current applications and avenues of research 

in twistor theory.  He offers several alternative offline sources 

of information on the topic.

General Info

1) http://www.britishcouncil.org/science/science/personalities/text/ukperson/penrose.htm

	A general site that has a lot of basic info and a picture that I 

used.

2) http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Penrose.html

	This site has a lot of general information, but in specific it has 

an overview of his published papers and major works, including his 

collaborative efforts with Hawking and his twistor papers.

3) Penrose, Roger. The Emporer's New Mind.  NewYork: Oxford UP, 1990.

Drawings and Pictures

1) http://spaceboy.nasda.go.jp/note/kagaku/e/kag0211_penrose_e.html

      sketch of penrose in japanese sort of style

2)      http://www.resonancepub.com/rpenrose.htm

	Another of eschers drawings, so I cited although public domain,
	Also a source and confirmation of the toilet paper incident.




Tilings


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