Nisha G Shetty, Charyulu RN., Marina K., and Shastry C. S. “Investigation of PH Dependent in Situ Gel Forming Solutions of Imidazoline Drug for Ocular Administration”. International Journal of Research in Pharmaceutical Sciences, vol. 3, no. 1, Mar. 2012, pp. 120-6, https://ijrps.com/home/article/view/3264.