1. G. O. Conabers, Journal of International Society of Leather Trades Chemists 28 (1944) 270.
2. ??Idem, ibid 25 (1941) 305.
3. ??Idem, ibid 28 (1944) 3.
4. M. Dempsey, ?Progress in Leather Science? (1920?1945) (British Leather Manufacturers' Research Association, London, 1948) p. 319.