1. D. McFadden, Tinnitus: Facts, Theories and Treatments, National Academy Press, Washington, DC, 1982, p. 1.
2. R.Y. Flower, S. Moncada and Y.R. Vane, in A.G. Gilman, L.S. Goodman and A. Gilman (Editors), The Pharmacological Basis of Therapeutics, Macmillan, New York, 6th ed., 1980, p. 682.
3. L.P. Rybek, Ann. Rev. Pharmacol. Toxicol., 26 (1986) 79.
4. J. Vernon, in J.W.P. Hazell, (Editor), Tinnitus, Churchill Livingstone, New York, 1987, p. 71.
5. P.J. Jastreboff and C.T. Sasaki, J. Acoust. Soc. Am., 80 (1986) 1384.