Calderón, Juan, Elizabeth Alán, and Uriel Barrantes. “ Size and Production of Weed Seeds in the Humid Tropic”. Agronomía Mesoamericana 11, no. 1 (January 1, 2006): 31–39. Accessed December 2, 2024. https://revistas.ucr.ac.cr/index.php/agromeso/article/view/17337.