Checa, Oscar, Herlin Ortega, and Vicente Mora. 2012. “Agronomic Behavior of Improved Genotypes of Broccoli (Brassica Oleracea L. Var. Itálica) According to Plantation Distance”. Revista De Ciencias Agrícolas 29 (1), 113-23. http://revistas.udenar.edu.co/index.php/rfacia/article/view/373.