NAME
Parse::Marpa::BIBLIOGRAPHY - A Marpa Bibliography
WIKIPEDIA ON BNF
Wikipedia's article on Backus Naur form is http://en.wikipedia.org/wiki/Backus-Naur_form. It's a great place to start if you don't know the basics of grammars and parsing.
As it points out, it might better be called Panini-Backus Form. The grammarian Panini gave a precise description of Sanskirt more than 23 centuries earlier in India using a similar notation.