AdiningsihE. S. and .K., “<b>VARIABILITY OF NORMALIZED DIFFERENCE VEGETATION INDICES IN SUMATRA AND ITS RELATION TO CLIMATE ANOMALIES</b&gt;(KERAGAMAN INDEKS VEGETASI DI SUMATERA DAN HUBUNGANNYA DENGAN ANOMALI IKLIM)”, Agromet, vol. 19, no. 1, pp. 21-38, Jun. 2005.