Bahadur, S., S. Manisha, P. Baghel, K. Yadu, and T. Naurange. “An Overview on Various Types of Gastroretentive Drug Delivery System”. ScienceRise: Pharmaceutical Science, no. 6 (28), Dec. 2020, pp. 4-13, doi:10.15587/2519-4852.2020.211931.