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Directory Sites

Context-free Grammar
A Wikipedia article that defines context free grammars and uses them to generate context free languages.
en.wikipedia.org
Context Free Languages
A set of lectures on context free languages, context free grammars and pushdown automata. (PDF)
www.cs.brown.edu
Context-Free Grammars and Parsing
An article defining the grammar and how Binary Normal Form (BNF) is used to parse words in a context free language. An example shows how operator precedence is preserved in a context free grammar.
eli-project.sourceforge.net
Context Free Grammars and Languages
Article defines terms and proves that context free languages are accepted by pushdown automata. It also gives examples from programming languages and discusses closure properties. (PDF)
www.jn.inf.ethz.ch
Push-Down Automata and Context-Free Grammars
Lecture notes defining context free grammars and closure and decidability properties of context free languages. There is a short section showing that natural languages are not context free.
people.umass.edu
Formal Grammars and Languages
A survey article on formal systems that define families of formal languages arising in many computer science applications with primary focus on context-free languages.
www.cs.ucr.edu
Formal Languages and Compilers
Course notes onthe definition of formal languages and the use of context free languages in compiler construction.
shekel.jct.ac.il

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