R K, Venisetty, et al. “Development of RP-HPLC Method for the Analysis of Levocetirizine. 2HCl and Ambroxol. HCl in Combination and Its Application ”. International Journal of Pharmaceutical Sciences and Nanotechnology(IJPSN), vol. 3, no. 1, May 2010, pp. 893-6, doi:10.37285/ijpsn.2010.3.1.15.