1. J. Soc. Ghem. Ind., 54, IT (1935);
2. British Patents Nos. 450, 308, 450, 309, and 474, 361, and foreign equivalents; Annual Reports of the Water Pollution Research Board for the years ended 30th June, 1935, 1930, 1937 and 1938 (H.M. Stationery Office).