Pravallika, Y., and K. Rajyalakshmi. “Formulation and Evaluation of Gastroretentive Hydrochlorothiazide Floating Microspheres: Statistical Analysis”. PharmaTutor, Vol. 4, no. 1, Jan. 2016, pp. 28-36, http://www.pharmatutorjournal.com/index.php/pt/article/view/331.