Kennedy, C., Steinberger, J., Gasson, B., Hansen, Y., Hillman, T., Havránek, M., Pataki,
D., Phdungsilp, A., Ramaswami, A. and Mendez, G. V. (2009). "Greenhouse gas emissions
from global cities." Environmental Science and Technology, Vol. 43, No. 19, pp. 7297-7302.
10.1021/es900213p