N. DAMODHARAN, B. KRISHNAMOORTHY, B. SENTHIL KUMAR, and C. SOUNDRAPANDIAN, “Chitosan-Polyethylene Glycol Blend Films as Local Ophthalmic Drug Delivery Units: in vitro Studies and Factors Influencing Drug Release”, ajc, vol. 20, no. 5, pp. 3649–3656, Mar. 2010.