S. . Khan, P. . Giradkar, P. . Nakhat, and P. . Yeole, “Effects of Weak and Strong Cation Exchange Resins on MoistureUptake Behaviorof Ranitidine Hydrochloride: Effect of resins on hygroscopicity of ranitidine”, Iran J Pharm Sci, vol. 3, no. 1, pp. 31–36, Jan. 2007.