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.