Hopkins; Chisholm; Harris Canadian Journal of Research, Section B: Chemical Sciences, 1949 , vol. 27, p. 38,40 Full Text Show Details Vesely; Chudozilov Collection of Czechoslovak Chemical Communications, 1930 , vol. 2, p. 98,101,102 Chem. Zentralbl., 1930 , vol. 101, # I p. 2540