S. J.  Walsh and Davis, F. W., ?Applications of remote sensing and geographic information systems in vegetation science: Introduction?, Journal of Vegetation Science, vol. 5, pp. 610-613, 1994.

F. W.  Davis, Quattrochi, D. E., Ridd, M. K., Lam, N. S. N., Walsh, S. J., Michaelsen, J. C., Franklin, J., Stow, D. A., Johannsen, C. J., and Johnston, C. A., ?Environmental analysis using integrated GIS and remotely sensed data: Some research needs and priorities?, Photogrammetric Engineering and Remote Sensing, vol. 57, pp. 689-697, 1991.