Coffey et al.
Journal of the Chemical Society, 1935 , p. 1205,1207
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Barton
Journal of the Chemical Society, 1946 , p. 512,517
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Callow; Young
Proceedings of the Royal Society of London, Series A: Mathematical, Physical and Engineering Sciences, 1936 , vol. 157, p. 194,198

Coffey et al.
Journal of the Chemical Society, 1935 , p. 1205,1207