Feldmann, E. , Mahler, W., and Koehler, H.Principles in the Spectrophotometric Determination of Propoxycaine in the Presence of Procaine, J. Amer. pharm. Ass., 47:676-80, 1958.
2.
Hawk, P.B., Oser, B.L., and Summerson, W.H.Practical Physiological Chemistry, p. 872. 13th ed. New York: Blakiston Press, Inc., 1954 .
3.
Clark, W.M.Determination of Hydrogen Ions, p. 201. Baltimore: Williams & Wilkins Co., 1928.
4.
Mellon, M.G.Analytical Absorption Spectroscopy, p. 318. New York: John Wiley & Sons, Inc., 1950.
5.
Flexser, L., Hammett, L., and Dingwall, A.The Determination of Ionization by Ultraviolet Spectrophotometry: Its Validity and Its Application to the Measurements of the Strength of Very Weak Bases , J. Amer. chem. Soc., 57:2103-15, 1935.
6.
Vandenbelt, J. , Henrich, C., and Vanden Berg , S.Comparison of pK'a Values Determined by Electrometric Titration and Ultraviolet Absorption Methods, Analyt. Chem., 26:726-27, 1954.
7.
Parke, T., and Davis, W.Use of Apparent Dissociation Constants in Qualitative Organic Analysis, Analyt . Chem., 26:642-45, 1954.
8.
Eisenbrand, J. , and Picher, H.Estimation of Dissociation Constants, Solubilities and Distribution Coefficients of Pantocaine and Procaine Bases , Arch. Pharm., 276:1-17, 1938.
