Authors: Zhechev, D.; Atanassova, S.
Source: Vacuum, Volume 51, Number 2, October 1998, pp. 85-88(4)
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Document Type: Research Article
Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., BG-1784, Sofia, Bulgaria
Publication date: October 1, 1998