C. M. Zhen, M.F. Mohd Amin, S. Onsanit, M. S. M. Rasat, N. H. Abdullah, T.C. Ling, K.N.S.W.S. Wong, N. Adnan, N.J. Ramli, “Correlation of Dissolved Oxygen and Nitrate in Aquaculture Pond Integrated Sensor System ”, IJAST, vol. 29, no. 5s, pp. 1986 - 1992, May 2020.