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[Matthieu Verstraete <mjv500@york.ac.uk>]

No this is not implemented yet. The group in Paris is working on it, and 
it could even be in the next release - stay tuned and check Xavier's 
emails at release time.

The formalism is very involved because the perturbations change the 
position of all the PAW spheres etc... you get Pulay forces and their 
equivalent for higher derivatives.

Matthieu

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Dr. Matthieu Verstraete                 mailto:mjv500@york.ac.uk
Dept. of Physics, University of York,     tel: +44 1904 43 22 08
Heslington, YO10 5DD York, United Kingdom fax: +44 1904 43 22 14