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Elsevier‎(2000)‎

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By Spassova E.   Jivkov I.   Strijkova V.   Assa J.   Danev G.   Ihlemann J.   in Vacuum

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Elsevier‎(2000)‎

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By Spassova E.   Jivkov I.   Danev G.   Dimitrova T.   Koprinarova J.   Paskaleva A.   in Vacuum

ISSN:0042-207X|47|11|1345-1346

Elsevier‎(1996)‎

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