Gmelin Handbook: S: SVol.3, 3.1.7.7.1, page 313 - 314 Full Text Show Details Houdry Process Corp. Patent: US2492938 , 1950 ; C.A., 1950 , p. 3004 Full Text Show Details Houdry Process Corp. Patent: US2493038 , 1950 ; C.A., 1950 , p. 4021