Damodaran, Purushothaman, Murali Krishnamurthi, and Krishnaswami Srihari. “Lower Bounds For Hierarchical Chinese Postman Problem”. International Journal of Industrial Engineering: Theory, Applications and Practice 15, no. 1 (February 24, 2022): 36–44. Accessed June 19, 2026. https://www.ijietap.com/ijietap/index.php/ijie/article/view/60.