1. Bhaduri, B., Bright, E., Coleman, P. & Dobson, J. E. LandScan: Locating people is what matters. Geoinformatics 5, 34–37 (2002).
2. McMichael, A. J. Planetary Overload: Global Environmental Change and the Health of the Human Species (Cambridge University Press, 1993).
3. Harrison, P. The Third Revolution: Population, Environment and a Sustainable World (Penguin Books, 1993).
4. Woods, R. & Rees, P. Spatial demography: themes, issues and progressin Population Structures and Models: Developments in Spatial Demography (eds Woods R. & Rees P. ) (Allen & Unwin, 1986).
5. Kates, R. W., Turner, B. L. II & Clark, W. C. in The earth as transformed by human action: Global and regional changes in the biosphere over the past 300 years (eds Turner B. L. et al.) Ch. 1. (Cambridge University Press, 1990).