Nakov, N.; Acevska, J.; Brezovska, K.; Petkovska, R.; Dimitrovska, A. Optimization of Hydrophilic Interaction Liquid Chromatographic Method for Simultaneous Determination of Cetylpyridinium Chloride and Benzocaine in Lozenges. Maced. J. Chem. Chem. Eng. 2012, 31, 47-54.