1. J. G. Ferwerda and A. K. Skidmore, "Can nutrient status of four woody plant species be predicted using field spectrometry," ISPRS J. Photogramm. Remote Sens. 62, 406 - 414 (2007) 10.1016/j.isprsjprs.2007.07.004
2. R. F. Koklay and R. N. Clark, "Spectroscopic determination of leaf biochemistry using band-depth analysis of absorption features and stepwise multiple linear regression," Remote Sens. Environ. 67, 267 - 287 (1999) 10.1016/S0034-4257(98)00084-4
3. P. J. Curran, "Imaging spectrometry for ecological applications," Dept. Geography, University of Southampton, UK (2000) http://las.physik.uni-oldenburg.de/conferences/imaging-spectroscopy-2000/papers/Curran57.pdf Accessed on 24th July 2008
4. F. Ahmed, "Remote sensing and current forest information needs in South Africa." Presented at IUFRO Precision Forestry Conference 2006, pp. 195 - 204, March 5-10 2006, Stellenbosch, South Africa.
5. J. H. Meyer and M. G. Keeping, "The impact of nitrogen and silicon nutrition on the resistance of sugarcane varieties to Eldana saccharina (Lepidoptera: Pyralidae)," Proc. South African Sugar Technol. Assoc. 79, 363 - 367 (2005a).