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Ettlinger; Hodgkins
Journal of the American Chemical Society, 1955 , vol. 77, p. 1831,1834
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Roberts; Mazur
Journal of the American Chemical Society, 1951 , vol. 73, p. 2509,2515
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Kjaer et al.
Acta Chemica Scandinavica (1947-1973), 1953 , vol. 7, p. 518,524