1. Rau, P. & Rau, N. Trans. Acad. Sci. St Louis 26, 83–221 (1929).
2. Boeckh, J., Kaissling, K. -E. & Schneider, D. Zool. Jahrb. Abt. Anat. 78, 559–584 (1960).
3. Kaissling, K. -E. & Thorson, J. in Receptors for Neurotransmitters, Hormones and Pheromones in Insects (eds Satelle, D. B., Hall, L. M. & Hildebrand, J. G.) 261–282 (Elsevier, Amsterdam, 1980).
4. Steinbrecht, R. A. & Kasang, G. in Int. Symp. Olfaction and Taste Vol. 4 (ed. Schneider, D.) 193–199 (Wiss, Stuttgart, 1972).
5. Steinbrecht, R. A. & Muller, B. Z. Zellforsch. mikrosk. Anat. 117, 570–575 (1971).