Pollak et al. Monatshefte fuer Chemie, 1930 , vol. 55, p. 358,373 Full Text Show Details Corbellini; Albenga Gazzetta Chimica Italiana, 1931 , vol. 61, p. 111,120 Full Text Show Details Macbeth; Price; Winzor Journal of the Chemical Society, 1935 , p. 325,327