Thanks again Dr Gavin for the explanation Since the total potential Vt is calculated by the program lapw0, we can find in the repertory SRC_lapw0 how the diiferent parts are implemented and their formulas.
On other side, I think the new library LIBXC contains all the formulas of the didderent parts for energy and potential. Best regards -- Mr: A.Reggad Laboratoire de Génie Physique Université Ibn Khaldoun - Tiaret Adresse: BP 144 AL ATTAF AIN DEFLA Tel: +213(0)561861963 Algerie
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