open source and classified software

Does anyone know of any articles related to open source software and
classified software? Can Open Source be used to develop classified software,
or is that an oxymoron? I'm trying to find anything that comments on the
possibilities(or impossibilities) of the two working together.

Thanks

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Lucas Vogel, Software Developer
Technology Development Practice
Exponent, Inc.
lvogel@exponent.com
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http://www.exponent.com