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It is sometimes facetiously known as Squiggol, because of the "squiggly" symbols it uses. A less-used variant name, but actually the first one suggested, is SQUIGOL.
- Richard Bird; Oege de Moor (1997). Algebra of Programming, International Series in Computing Science, Vol. 100. Prentice Hall. ISBN 0-13-507245-X.
- Bird Meertens Formalism on the Program Transformation Wiki
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