R. Hill-Rowley, L. Kirton, L. Ratnam and S. Appanah 1996. THE USE OF A GRID-BASED GEOGRAPHIC INFORMATION SYSTEM TO EXAMINE ECOLOGICAL RELATIONSHIPS WITHIN THE PASOH 50-HA RESEARCH PLOT. Journal of Tropical Forest Science (JTFS) . 8, 4 (Jun. 1996), 570–572.