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ISSN 1026!9045
ISSN 1026!9045
2004!"#$ #%&'()*&$'&%
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Carlos FiolhaisPhysics Department, University qfCoimbra,
Portugal
Jorge A. TrindadePhysics Department, Polytechnic Institute ofGuarda,
Portugal
18M:2N/:<4916 +:3MNOP6-:< M-1 1/QR691168P68P<699,S 94Q+
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