Birkinshaw J H, Charles J H, Clutterbuck P W
The Biochemical Department, Ardeer Factory (Imperial Chemical Industries, Ltd.), Stevenston, Ayrshire and the Division of Biochemistry, London School of Hygiene and Tropical Medicine, University of London.
Biochem J. 1931;25(5):1522-39. doi: 10.1042/bj0251522.