Dr. Revathi K Sivadas, Mr. Jovin P John. “Returns to Scale and Elasticity of Natural Rubber Production in Kerala, India.”. International Journal of Modern Agriculture 10, no. 2 (May 17, 2021): 3501 - 3507. Accessed May 4, 2024. http://www.modern-journals.com/index.php/ijma/article/view/1197.