Karunananttha Gunasegeran and Mohd Hakimi Bin Zohari (2025) “IOT Based Outdoor Manhole Detection and Monitoring System”, Progress in Engineering Application and Technology, 6(2), pp. 225–234. Available at: https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/21062 (Accessed: 9 April 2026).