Kochar, M. P., and S. P. Singh. “Role of Nano-Collagen Particles Dressing in the Management of Chronic Ulcer: A Prospective Non-Randomized Trial on 100 Cases”. International Surgery Journal, vol. 7, no. 3, Feb. 2020, pp. 802-6, doi:10.18203/2349-2902.isj20200826.