Prajwalasimha S. N., Sahana G. C., Vaani K. “Fingerprint Image Denoising in Spatial Domain: An Implementation Based on a Combined Median and Average Filtering Approach”. International Journal of Advanced Science and Technology, Vol. 29, no. 3, Mar. 2020, pp. 13559 -72, http://sersc.org/journals/index.php/IJAST/article/view/31686.