D. W. P. C. P. P. Suwannakan Supmattrra, Piyaporn Jitaek, Khongdet Phasinam, “EFFECTS OF WATER LEVELS AND DISSOLVED OXYGEN CONCENTRATION ON THE GROWTH OF CELERY CULTIVATED IN A DFT HYDROPONIC SYSTEM”, DE, pp. 3669- 3675, Jul. 2021.