By Toneva A.   Mihailova T.   Sueva D.   Georgiev S.   in Vacuum

ISSN:0042-207X|47|10|1207-1209

Elsevier‎(1996)‎

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By Sueva D.   Georgiev S.S.   Nedev N.   Toneva A.   Chikov N.   in Vacuum

ISSN:0042-207X|58|2|308-314

Elsevier‎(2000)‎

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