By Alexandrova S.   Szekeres A.   Halova E.   Modreanu M.   in Vacuum

ISSN:0042-207X|69|1|385-389

Elsevier‎(2002)‎

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By Alexandrova S.   Kaschieva S.   Halova E.   Valcheva E.   Szekeres A.   in Vacuum

ISSN:0042-207X|69|1|103-106

Elsevier‎(2002)‎

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