E. Ernayunita, S. Wening, H. Y Rahmadi, Y. Yenni, and T. Taryono, “Conservation of Pisifera Genetic Resources: Callogenesis of 41 Years Old SP540T - Derived Oil Palm”, J. Penelitian Kelapa Sawit, vol. 29, no. 2, pp. 73-80, Aug. 2021.