Thanks Mr Gavin <http://www.mail-archive.com/search?l=wien@zeus.theochem.tuwien.ac.at&q=from:%22Gavin+Abo%22> for your reply and your interest for my questions
I'm very gratful -- Mr: A.Reggad Laboratoire de Génie Physique Université Ibn Khaldoun - Tiaret Algerie
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