1. Kadota, H., and Ishida, Y., A. Rev. Microbiol., 26, 127–138 (1972).
2. Pandeya, S. N., J. scient. ind. Res., 31, 320–331 (1972).
3. Blum, M. S., Proc. seventh Congr. IUSSI, Lond., 23–40 (1973).
4. Crewe, R. M., and Fletcher, D. J. C., J. ent. Soc. sth. Afr., 37, 291–298 (1974).
5. Casnati, G., Ricca, A., and Pavan, M., Chemica Ind., Milano, 49, 57–58 (1967).