Reviewed :

• Gruber, N. and J.L. Sarmiento, Global patterns of marine nitrogen fixation and denitrification.
  Global Biogeochemical Cycles, 11, 235-266, 1997.
  (PDF-Version of text) [PDF-Version of figures)

Others:

• Gruber, N. Aspects of the Marine Carbon and Nitrogen Cycles and their perturbation by mankind: Combining Observations and Models. Ph. D. thesis. Phys. Inst., Univ. Bern, Bern, Switzerland, 1997.