“Optimization of Planting Density of Indian Spinach in a Recirculating Aquaponics System Using Nile Tilapia: Planting of Indian Spinach in an Aquaponics System”, Pakistan Journal of Scientific & Industrial Research, vol. 65, no. 1, pp. 18–27, Feb. 2022, doi: 10.52763/PJSIR.BIOL.SCI.65.1.2022.18.27.