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3. Jones, S.W., Sudershan, P., and O'Brien, R.D., J. Neurochem.36 (1981) 447.
4. Satelle, D.B., Harrow, I.D., and Hue, B., in: Receptors for Neurotransmitters, Hormones and Pheromones in Insects, p. 125. Eds D.B. Satelle L.M. Hall and J.G. Hildebrand. Elsevier, Amsterdam 1981.
5. Benn, M.H., and Jacyno, J.M., in: Alkaloids: Chemical and Biological Perspectives, Vol. 1, p. 153. Ed. S.W. Pelletier J. Wiley & Sons, New York 1983.