1. Annual Reports of the Fuel Research Board for the year ended 31st March, 1937, pp. 136–147;
2. Annual Reports of the Fuel Research Board for the year ended 31st March, 1938, pp. 180–206;
3. Annual Reports of the Fuel Research Board for the year ended 31st March, 1939, pp. 151–164.
4. Ruhrchemic A.G., B.P. Appln. No. 14431/1937.