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International School on Vacuum, Electron and Ion Technologies (7th : 1991 : Plovdiv, Bulgaria)
7th International School on Vacuum, Electron and Ion Technologies : 23-27 September 1991, Plovdiv, Bulgaria / guest editors, Dimitre Karpuzov and S.S. Todorov.
— Oxford : Pergamon, 1993. p. 1075-1196. — (Vacuum, ISSN 0042-207X ; v. 44, no. 11/12)
Cabecera de portada: Special issue.
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