UBLAS
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Copyright (c) 2000-2004 Joerg Walter, Mathias Koch

Distributed under the Boost Software License, Version 1.0. (See
accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)

1.35.0
  Updated all files to BSL v1 with permission of the authors.

PRE 1.34.0
  FIX size_type and difference_type can be non defaults and uBLAS 
  expressions use the correct types.