K, D. U. .; Agrawal, P. . Extraction of Cellulose Nano-Crystals from Polyalthia Longifolia and Terminalia Catappa Leaf Litter and the Synthesis of Low-Cost CNC-Based Hydrogel for Articular Cartilage. GSC Biol. Pharm. Sci. 2021, 16, 019-026.