Tanaka; Asami Journal of the Scientific Research Institute, Tokyo, 1954 , vol. 48, p. 287,293 Full Text Show Details Rheinpreussen A.G. Patent: DE954425 , 1956 ; Full Text Show Details Steinkohlen-Bergwerk Rheinpreussen Patent: DE842944 , 1951 ; DRP/DRBP Org.Chem.