Lakshmanan, V., and D. C. Das. “A Nomograph Solution for Determination of Diameters of Tile Drains in Metric Units”. Indian Forester 102, no. 7 (July 1, 1976): 455–458. Accessed February 20, 2026. https://indianforester.co.in/index.php/indianforester/article/view/11920.