Dimple Thakwani, and Dr N. Tripathi. “PLC Based Change Dispensing Machines Capable of Identifying Counterfeit Currency Using Sensors”. International Journal of Advance Engineering and Research Development (IJAERD), vol. 3, no. 10, Oct. 2016, pp. 76-79, https://ijaerd.org/index.php/IJAERD/article/view/1720.