An agro-economic survey of the weeds and weeding practices in cassava (Manihot esculenta Crantz) in Colombia
Guatemala: sus recursos fitogenéticos para la seguridad alimentaria y la evolución de la agrobiodiversidad mesoamericana . Universidad del Valle, Guatemala, 28 abril 2011
Regional relationships between inherent coffee quality and growing environment for denomination of origin labels in Nariño and Cauca, Colombia