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2. Plesch, Polanyi and Skinner, Discussion on "Some Aspects of the Chemistry of Macromolecules", J. Chem. Soc., 257 (1947).
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4. Evans, A. G., Meadows and Polanyi, Nature, 158, 94 (1946).
5. Evans, Meadows and Polanyi (see following letter).