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Gerritsma W., . and Soebagyo F.X., . and Redshaw M.J., . (1992) Analysis of yield trends in two cultivar trials in Indonesia. [Proceedings Paper]
Kartika D., . and Soebagyo F.X., . and Turner P.D., . and Breure C.J., . (1986) Severe stem bleeding and frond fracture of MAWA hybrid coconuts in North Sumatra. [Proceedings Paper]