Vogel, J. C., Talma, A. S., & Heaton, T. H. E. (1981). Gaseous nitrogen as evidence for denitrification in groundwater. Journal of Hydrology, 50, 191–200.
Abstract: By investigating the nitrate, oxygen, nitrogen and argon concentrations and 15N14N ratios in artesian groundwater with radiocarbon ages ranging up to 27,000 yr. a process of very slow denitrification in a confined aquifer is demonstrated. The calculated nitrogenisotope fractionation factor associated with this reaction is comparable to that reported for bacterial cultures in vitro and in vivo.
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Wolfe, P. (1959). The Simplex Method For Quadratic Programming. Econometrica, 27, 170.
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Adolph, G., Römer, T., & Külls, C. Deriving complex groundwater age structure by combining age dating and analytic element modelling. In G-DAT 2008-Leipzig (12).
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Külls, C., Haering, M., Leistert, H., & Oster, H. Hydrological, physical and chemical constraints for groundwater age dating with CFC and SF6. In G-DAT 2008-Leipzig (29).
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