E. M. Barreno Avila, M. A. Córdova Suárez, J. H. Vargas López, and M. D. Calderón Valdiviezo, “Water hyacinth (Eichhornia Crassipes (Mart.) Solms) and water duckweed. (Lemna Spp.) to reduce the hardness of irrigation water”, CCD, vol. 3, no. 1.1, pp. 133-146, Feb. 2020.