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→Resources: + author link
*[http://mathworld.wolfram.com/ MathWorld — A Wolfram Web Resource]
*[http://mathworld.wolfram.com/ MathWorld — A Wolfram Web Resource]
** Weisstein, Eric W., [http://mathworld.wolfram.com/Spencer-BrownForm.html Spencer-Brown Form].
** [http://mathworld.wolfram.com/about/author.html Weisstein, Eric W.], [http://mathworld.wolfram.com/Spencer-BrownForm.html Spencer-Brown Form]
*[http://www.math.uic.edu/~kauffman/ Kauffman, Louis H.]
*[http://www.math.uic.edu/~kauffman/ Kauffman, Louis H.]