Study of the production system of coffee (Coffea arabica L.) in the Frailesca region, Chiapas Alfredo Medina-Melendez, J.; Eleazar Ruiz-Najera, R.; Cesar Gomez-Castaneda, J.; Manuel Sanchez-Yanez, J.; Gomez-Alfaro, G.; Pinto-Molina, O. Cienciauat 10(2): 33-43 2016 https://eurekamag.com/research/070/782/070782894.php