Nanhorya, Rajesh, Rajesh Shrivastava, and J. K. Upadhyaya. “Polytube : A Low Cost Alternative for Root-Trainer”. Indian Forester 125, no. 4 (April 1, 1999): 355–369. Accessed July 10, 2025. https://indianforester.co.in/index.php/indianforester/article/view/5498.