1. Seto, K. C. et al. Int. J. Remote Sensing (submitted).
2. Kaufmann, R. K. & Seto, K. C. Agriculture Ecosystems and Environment (submitted).
3. Statistical Bureau of Guangdong Statistical Yearbook of Guangdong (China Statistical Publishing House, Beijing, annually).
4. Ramankutty, N. & Foley, J. A. Glob. Biogeochem. Cycles 13, 997–1027 (1999).
5. Heilig, G. Population Dev. Rev. 23, 139–168 (1997).