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Digital techniques in electron off-axis holography, G. Ade optical symbolic substitution architectures, M.S. Alam and M.A. Karim semiconductor quantum devices, M. Cahay and S. Bandyopadhyay fuzzy relations and applications, B. de Baets and E. Kerre basis algorithms in mathematical morphology, R. Jones and I.D. Svalbe mirror-bank energy analyzers, S.P. Karetskaya et al.
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Marton et al. (1960) studied this question.
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