CONCEPCION II, R. ., E. . DADIOS, J. . CUELLO, A. . BANDALA, E. . SYBINGCO, and R. R. . VICERRA. “Determination of Aquaponic Water Macronutrient Concentrations Based on Lactuca Sativa Leaf Photosynthetic Signatures Using Hybrid Gravitational Search and Recurrent Neural Network”. Walailak Journal of Science and Technology (WJST), vol. 18, no. 10, May 2021, p. Article 18273 (20 pages), doi:10.48048/wjst.2021.18273.