By Dikova J.   Sharlandjiev P.   Gushterova P.   Babeva T.   in Vacuum

ISSN:0042-207X|69|1|395-398

Elsevier‎(2002)‎

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By Babeva T.   Dimitrov D.   Kitova S.   Konstantinov I.   in Vacuum

ISSN:0042-207X|58|2|496-501

Elsevier‎(2000)‎

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