Rodríguez-RuizA., Chaves-BarrantesN., Hernández-DíazA., and Herrera-MurilloF. “Assessment of Poa Annua Resistance to Clethodim in Costa Rica.”. Agronomía Mesoamericana, Vol. 26, no. 2, June 2015, pp. 257-66, doi:10.15517/am.v26i2.19325.