Abubakar, M., Jaroucheh, Z., Dubai, A. A., & Liu, X. (2022). A Lightweight and User-centric Two-factor Authentication Mechanism for IoT Based on Blockchain and Smart Contract. In (pp. 91–96). Riyadh, Saudi Arabia: IEEE. http://doi.org/10.1109/SMARTTECH54121.2022.00032 (Original work published 2025)