D. M.  Stoms, Davis, F. W., and Hollander, A. D., ?Hierarchical representation of species distributions for biological survey and monitoring?, in GIS and Environmental Modeling: Progress and Research Issues, M. F.  Goodchild, Steyaert, L. T., and Parks, B. O., Eds. Fort Collins, Colorado: GIS World Books, 1996, pp. 445-449.

D. M.  Stoms, Davis, F. W., and Hollander, A. D., ?Hierarchical representation of species distributions for biological survey and monitoring?, in GIS and Environmental Modeling: Progress and Research Issues, M. F.  Goodchild, Steyaert, L. T., and Parks, B. O., Eds. Fort Collins, Colorado: GIS World Books, 1996, pp. 445-449.