Unigarro, Carlos Andrés, et al. “Effects of four ethylene inhibitors on the ripening of coffee (Coffea arabica L.) fruits during the pre-harvest period”. Revista Colombiana de Ciencias Hortícolas, vol. 12, no. 2, Sept. 2018, pp. 500-7, doi:10.17584/rcch.2018v12i2.7667.