Authors: Zhivkov, I.; Spassova, E.; Danev, G.; Ivanov, T.; Andreev, S.
Source: Vacuum, Volume 51, Number 2, October 1998, pp. 189-192(4)
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Document Type: Research Article
Central Laboratory of Photoprocesses, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl.109, 1040 Sofia, , Bulgaria
Publication date: October 1, 1998