Oil Palm Bulletin No. 68 (May 2014) p1-4
Ekona x Deli Dura Materials: Promising High Oil-to-Bunch Dura Materials
Joko Handoko Hadi Prasetyo*, Baihaqi Sitepu*, Jajan Djuhjana* and Stephen P C Nelson*

Oil Palm Bulletin No. 66 (May 2013) p8-12
Performance of SumBio Semi-clonal Progenies
Joko Handoko Hadi Prasetyo*, Baihaqi Sitepu*, Harry E Iswandar*, Jajan Djuhjana* and Stephen P C Nelson*