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Martin Schlipf authored
for stress calculations not only the potential but the derivative is needed as well create class that encapsulates potential and derivative generator function in HSEFunctional to create the new type git-svn-id: http://qboxcode.org/svn/qb/branches/hse-dev@1400 cba15fb0-1239-40c8-b417-11db7ca47a34
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