Bajaj, Miss., C. Pande, and B. Venkataramani. “A Note on Semirigid Polyurethane Forms Based on Castor Oil”. Defence Science Journal 14, no. 3 (May 9, 2014): 277-280. Accessed February 19, 2020. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/7160.