Ramírez-Seañez, Ana, Juan Contreras-Martínez, Arturo Palomo-Gíl, Vicente Álverez-Reyna, Sergio Rodríguez-Herrera, and Mario García-Carrillo. 1. Cotton biomass production as affected by ultra-narrow rows and population density. Agronomía Mesoamericana 23 (2), 259-67.