1. Schneider, D., in The NeuroSciences: Second Study Program (edit. by Schmitt, F. O.), 511 (Rockefeller University Press, New York, 1970).
2. Borg, T. K., and Norris, D. M., Z. Zellforsch., 113, 13 (1971).
3. Steinbrecht, R. A., and Muller, B., Z. Zellforsch., 117, 570 (1971).
4. Kaissling, K. E., in Handbook of Sensory Physiology Chemical Senses 1 Olfaction (edit. by Beidler, L. M.), 351 (Springer-Verlag, New York, 1971).
5. Riddiford, L. M., J. Insect Physiol., 16, 653 (1970).