V. KAVITHA, MAHESHWARI.M. IOT BASED CRACK DETECTING, OBSTACLE DETECTING AND ENERGY MINIMIZING ROBOT IN RAILWAY TRACK. Int. j. innov. eng. res. technol. 2021;6(6):1-5. Accessed July 4, 2024. https://repo.ijiert.org/index.php/ijiert/article/view/1851