C.Valenzuela, Ira, and Elmer P.Dadios. “Lettuce Cultivation Period Modelling: An Image Processing and Neuro-Fuzzy Based Approach”. International Journal of Engineering & Technology, vol. 7, no. 4, Dec. 2018, pp. 4271-7, https://doi.org/10.14419/ijet.v7i4.17421.