Khanna, D. R., Chugh, T., & Sarkar, P. (2001). Fluctuation in the Population Density of Macro-invertebrates of River Ganga at Pashulok Barrage, Rishikesh. (Uttranchal, India). Environment Conservation Journal, 2(1), 37–39. https://doi.org/10.36953/ECJ.2001.020104