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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By Smirnov N.   Nedev N.   Koprinarova J.   Dimitrov D.B.   in Vacuum

ISSN:0042-207X|47|9|1105-1106

Elsevier‎(1996)‎

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By Beshkov G.   Lei S.   Lazarova V.   Nedev N.   Georgiev S.S.   in Vacuum

ISSN:0042-207X|69|1|301-305

Elsevier‎(2002)‎

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