1. Banna, N. R., Anderson, E. G.: The effects of 5-hydroxytryptamine antagonists on spinal neuronal activity. J. Pharmacol. exp. Ther. 162, 319?325 (1968).
2. Geiger, L. E., Cervoni, P.: Effect of D-lysergic acid diethylamide on spinal reflexes. Proc. Soc. exp. Biol. (N.Y.) 99, 179?181 (1958).
3. Handschumacher, R. E., Vane, J. R.: The relationship between the penetration of tryptamine and 5-hydroxytryptamine into smooth muscle and the associated contractions. Brit. J. Pharmacol. 29, 105?118 (1967).
4. Krivoy, W. A.: Potentiation of substance P by lysergic acid diethylamide in vivo. Brit. J. Pharmacol. 16, 253?256 (1961).
5. Marley, E., Vane, J. R.: Tryptamines and spinal cord reflexes in cats. Brit. J. Pharmacol. 31, 447?465 (1967).