Wannarisuk Nongbsap, and Madan Mohan Singh. “A Public Key Cryptography Based on the M-Injectivity of $Z_{p q}$ over Itself”. Malaya Journal of Matematik, vol. 9, no. 01, Jan. 2021, pp. 130-5, https://www.malayajournal.org/index.php/mjm/article/view/986.