1. Bolton, T.B. (1973), The permeability change produced by acetycholine in smooth muscle. In: Rang, HP. (ed.), Drug Receptors. University Park Press, Baltimore, 87.
2. Bulbring, E., Brading, A., Jones, A.W. and Tomita, T. (eds.) (1971), Smooth Muscle. Edward Arnold, London.
3. Prosser, C.L. (1974), Smooth muscle. Ann. Rev. Physiol 36, 503.
4. Siegman, M.J. and Gordon, A.R. (1972), Potentiation of contraction: effects of calcium and caffeine on active state. Am. J. Physiol. 222, 1587.
5. Van Breemen, C., Aaronson, P. and Loutzenhiser, R. (1979), Sodium- calcium interactions in mammalian smooth muscle. Pharmac. Rev. 30, 167.