Mohammed Shoaibuddin Ahmed, Mohammed Noor Ahmed, Mohammad Mustafa Hussain, Syed Omer Farooq. “Smart and Secure Door Lock With Dual-Factor Authentication for Critical Zones”. Mathematical Statistician and Engineering Applications 72, no. 1 (January 12, 2023): 1491–1501. Accessed May 20, 2024. https://www.philstat.org/index.php/MSEA/article/view/2373.