Sisunandar, Sisunandar, Alkhikmah Alkhikmah, Arief Husin, and Aman Suyadi. 2015. “Embryo Incision As a New Technique for Double Seedling Production of Indonesian Elite Coconut Type “Kopyor””. Journal of Mathematical and Fundamental Sciences 47 (3):252-60. https://doi.org/10.5614/j.math.fund.sci.2015.47.3.3.