A.Gokul, and N.Zahira Jahan. “Secure Mobile Payment Transaction Scheme Using Optimistic Fair Exchange (OFE) Protocols With TPA Model”. International journal of intellectual advancements and research in engineering computations 7, no. 1 (March 30, 2019): 762–768. Accessed April 29, 2024. https://ijiarec.com/ijiarec/article/view/1004.