Alexander, Alex G., Ashok Kumar, Rafael Montalvo-Zapata, and Gene L. Spain. “Response of Sugarcane Enzymes to Variable Light: Variable Illumination Studies of Invertase, ATP-Ase and Amylase in Plants Experiencing Nitrate and Gibberellic Acid-Induced Stress”. The Journal of Agriculture of the University of Puerto Rico 54, no. 3 (July 1, 1970): 448–476. Accessed December 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/10984.