Kusnandar, D., N. N. Debataraja, and S. Marthal. “COPULA MODELING IN ANALYSIS OF DEPENDENCY OF OIL PALM PRODUCTION AND RAINFALL”. Indonesian Journal of Physics and Nuclear Applications, vol. 3, no. 3, Dec. 2018, pp. 89-94, doi:10.24246/ijpna.v3i3.89-94.