1. Goodman-Gilman, A., Goodman, L.S., Rall, T.W., and Murad, G., The Pharmacological Basis of Therapeutics, New York: Macmillan, 1985, p. 145.
2. Pharm. Codex, 1979, vol. 917, p. 800.
3. Kountourellis, J.E., Markopoulou, C., and Liq, J., Chromatographia, 1989, vol. 12, p. 3279.
4. Kennedy, B.M., Blomgren, A., Edholm, L.E., and Ross, C., Chromatographia, 1987, vol. 24, p. 895.
5. Sagar, K.A., Kelly, M.T., and Smyth, M.R., J. Chromatogr., 1992, vol. 577, p. 109.