1. T. W. Rall, in “The Pharmacological Basis of Therapeutics,” 7th Ed., ed. by Goodman and Gilman, Macmillan, New York, 1984, pp. 589–603.
2. N. J. Palleroni, in “Bergey’s Manual of Systematic Bacteriology,” Vol. 1, ed. by N. R. Krieg and J. G. Holt, The Williams and Wilkins Co., Baltimore, 1984, pp. 141–199.