Cleves-Leguízamo, J.A. et al. 2018. The Principal Agroecological Structure (PAS): a new tool for planning agroecosystems. Revista Colombiana de Ciencias Hortícolas. 11, 2 (Jan. 2018), 441–449. DOI:https://doi.org/10.17584/rcch.2017v11i2.7350.