Oil Palm Bulletin No. 13 (November 1986) p1 - 11
Volatilisation losses of nitrogen from urea applied to Malaysian soils Effect of granular size and soil properties
H.L. Foster and Zin Z. Zakaria

Oil Palm Bulletin No. 12 (May 1986) p1 - 11
The effect of different methods of placement and frequency of application of fertilizer to oil palm on an inland soil in Peninsular Malaysia
H.L. Foster and Mohd tayeb Hj Dolmat