By Yakimova R.   Paskova T.   Trifonova E.P.   in Thin Solid Films

ISSN:0040-6090|265|1|123-128

Elsevier‎(1995)‎

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By Dimitrova V.   Manova D.   Paskova T.   Uzunov T.   Ivanov N.   Dechev D.   in Vacuum

ISSN:0042-207X|51|2|161-164

Elsevier‎(1998)‎

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