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Datta, P.K., Ward, L.P., Hill, R. and Strafford, K.N.;
The Effects of Deposition Parameters on the Microstructure of Ion Plated Niobium Coatings. In "Surface Engineering : Practice : Fundamentals, Processes and Applications", Ellis Horwood, Chichester, U.K, Chapter 1.2.3, p. 89 (1990).