Concepcion II, Ronnie, et al. “Hybrid Genetic Programming and Multiverse-Based Optimization of Pre-Harvest Growth Factors of Aquaponic Lettuce Based on Chlorophyll Concentration”. International Journal on Advanced Science, Engineering and Information Technology, vol. 11, no. 6, Dec. 2021, pp. 2128-3, doi:10.18517/ijaseit.11.6.14991.