Mazhar, N., Dania Amjad, Kanwal Javid, Rumana Siddiqui, Muhammad Ameer Nawaz and Zaynah Sohail Butt (2020) “Mapping Fluctuations of Hispar Glacier, Karakoram, using Normalized Difference Snow Index (NDSI) and Normalized Difference Principal Component Snow Index (NDSPCSI)”, International Journal of Economic and Environmental Geology, 11(4), pp. 48–55. doi: 10.46660/int.j.econ.environ.geol. v11i4.868.