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3. Wasiak, A., Peiffer, D. and Stein, R.S.: 1976, J. Polym. Sci., Polym. Letters Ed. 14, p. 381.
4. Tabar, R., Stein, R.S. and Long, M.B., J. Polym. Sci., Polym. Phys. Ed., submitted for publication.
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