Gmelin Handbook: Na: SVol.1, 78, page 321 - 322 Full Text Show Details Mathieson Alkali Works Patent: GB407200 , 1934 ; C. A., 1934 , p. 4846 Full Text Show Details Mathieson Alkali Works Patent: FR753038 , 1933 ; C. I, 1934 , p. 293