Lederer et al. Helvetica Chimica Acta, 1946 , vol. 29, p. 1354,1362 Full Text Show Details Lederer; Mercier; Perot Bulletin de la Societe Chimique de France, 1947 , p. 345,348 Full Text Show Details Ruzicka; Duerst; Jeger Helvetica Chimica Acta, 1947 , vol. 30, p. 353,357