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2. Barbe, D. F.: 1975, Proc. I.E.E.E. 63, 38.
3. Belton, M. and Smith, G.: 1975 (private communication).
4. Dravins, D.: 1975 (this conference) D. Reidel, Dordrecht, p. 97.
5. Giovanelli, R. and Slaughter, C.: 1975 (private communication).