Kamireddy, Sirinivas R., Christopher Schaefer, Matt Defrese, John Degenstein, and Yun Ji. 2012. “Pretreatment and Enzymatic Hydrolysis of Sunflower Hulls for Fermentable Sugar Production”. International Journal of Agricultural and Biological Engineering 5 (1). Beijing, China:62-70. https://ijabe.org/index.php/ijabe/article/view/550.