López-Rocha, Enrique, Ana Mireles-Arriga, Jesús Hernández-Ruíz, Jorge Ruiz-Nieto, and Armado Rucoba-Garcia. “Potential Areas for Sunflower Cultivation under Rainfed Conditions in Guanajuato, Mexico”. Agronomía Mesoamericana 29, no. 2 (May 1, 2018): 305-314. Accessed March 26, 2019. https://revistas.ucr.ac.cr/index.php/agromeso/article/view/29771.