1. Bruce, D., “Preliminary Report on the Tsetse Fly Disease or Nagana, in Zululand” (Bennett and Davies, Durban, 1895). (Original not seen; quoted from Buxton, P. A., “The Natural History of Tsetse Flies” (London School of Hygiene and Tropical Medicine, Memoir 10 (1955)).
2. Stuhlman, F., Arb. Kaiserl Gesundheits., 26, 301 (1907). (Original not seen; quoted from Buxton, P. A., “The Natural History of Tsetse Flies”, London School of Hygiene and Tropical Medicine, Memoir 10 1955).
3. Roubaud, E., thesis No. 1344, University of Paris (1909).
4. Mellanby, H., Parasitol., 29, 131 (1937).
5. Mellanby, K., Parasitol., 29, 142 (1937).