1. Tracey, M. V., Nature, 175, 815 (1955).
2. Tracey, M. V., Second Intern. Cong. Biochem., Paris, 242 (1952).
3. Tracey, M. V., Nature, 167, 776 (1951).
4. Jeuniaux, Ch., Mém. Soc. Roy. Entom. Belg., 27, 312 (1955).
5. Jeuniaux, Ch., Arch. Intern. Physiol. Biochem., 64, 583 (1956)