Helmy, H. E. “Studies on Carotenoids and Oxidative Stability of Winter Squash Seed and Soybean Oils”. Grasas y Aceites 43, no. 6 (December 30, 1992): 313–316. Accessed April 24, 2024. https://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/1125.