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# Links
The primary resource for all things to do with parsing expressions can be found
on the original [Packrat and Parsing Expression Grammars page](http://pdos.csail.mit.edu/~baford/packrat)
at MIT.
Also, a useful summary of parsing expression grammars can be found on
[Wikipedia](http://en.wikipedia.org/wiki/Parsing_expression_grammar).
Citrus draws inspiration from another Ruby library for writing parsing
expression grammars, Treetop. While Citrus' syntax is similar to that of
[Treetop](http://treetop.rubyforge.org), it's not identical. The link is
included here for those who may wish to explore an alternative implementation.
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