Hill; Melhuish
Journal of the Chemical Society, 1935 , p. 1161,1164
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Karrer et al.
Helvetica Chimica Acta, 1943 , vol. 26, p. 2116,2118
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Reichel; Doering
Justus Liebigs Annalen der Chemie, 1957 , vol. 606, p. 137,145