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Bergstroem Helvetica Chimica Acta, 1949 , vol. 32, p. 3,5 Full Text Show Details Ruggli; Leupin; Businger Helvetica Chimica Acta, 1941 , vol. 24, p. 339,341, 342 Full Text Show Details Cook et al. Journal of the Chemical Society, 1944 , p. 322,324