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Elsevier‎(1998)‎

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By Kourtev J.   Groudeva-Zotova S.   Garnev I.   Orlinov V.   in Vacuum

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Elsevier‎(1996)‎

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By Koleva M.   Tomov R.   Zotova S.   Atanasov P.   Martin C.   Ristoscu C.   Mihailescu I.   in Vacuum

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Elsevier‎(2000)‎

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