By Lazarova V.   Spassov L.   Gueorguiev V.   Andreev S.   Manolov E.   Popova L.   in Vacuum

ISSN:0042-207X|47|12|1423-1425

Elsevier‎(1996)‎

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By Andreev S.K.   Popova L.I.   Gueorguiev V.K.   Manolov E.B.   in Vacuum

ISSN:0042-207X|47|11|1325-1328

Elsevier‎(1996)‎

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