===========================================================================
enable_if (http://www.boost.org/doc/libs/1_39_0/libs/utility/enable_if.html)
===========================================================================
Boost Software License - Version 1.0 - August 17th, 2003

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===========================================================================
Parts of vector and matrix code (http://www.cs.cmu.edu/~ajw/doc/vl.html)
===========================================================================

Except where otherwise noted, Copyright (c) 2000 Andrew Willmott.
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