Pierrot D., Neill C., Sullivan K., Castle R., Wanninkhof R., Lüger H., Johannessen T., Olsen A., Feely R. A. and Cosca C. E., 2009. Recommendations for autonomous underway pCO2 measuring systems and data-reduction routines. Deep-Sea Res. II 56, 512-522.
Takahashi T., Olafsson J., Goddard J. G., Chipman D. W. and Sutherland S. C., 1993. Seasonal variation of CO2 and nutrients in the high-latitude surface oceans: a comparative study. Glob. Biogeochem. Cycles 7, 843-878.