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3. W. Schmatz, T. Springer, J. Schelten and K. Ibel, J. Appl. Cryst. 7 (1974) 96.
4. G. Kostorz, in Neutron scattering, ed. G. Kostorz, vol. 15 in Treatise on Materials Science and Technology, H. Herman, series ed. (Academic Press, New York, 1979) p. 227.
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