Rayner, P. J., Giering, R., Kaminski, T., Menard, R., Todling, R., & Trudinger, C. (1999).
Exercises. In P. Kasibhatla, M. Heimann, D. Hartley, P. J. Rayner, N. Mahowald, & R. Prinn (Eds.),
Inverse methods in global biogeochemical cycles (pp. 81-106). Washington D.C.: American
Geophysical Union.