Guerrero, E. M., J. C. Revelo, O. Benavides B., G. Chaves J., and C. Álvaro Moncayo. “Evaluation of Substrates in a Hydroponic Lettuce Culture System in the Municipality of Pasto”. Revista De Ciencias Agrícolas, vol. 31, no. 1, Nov. 2014, pp. 3-16, doi:10.22267/rcia.143101.38.