References
- 1988 . Finnigan MAT: On-line delta 15N and 13C Isotope Processor. Technical note
- Pichlmayer , F. 1986 . On-line Coupling of the MAT 251 with a Carlo Erba Elemental Analyser for Carbon Ratio Measurements. Examples are shown on Lake Sediments. . Österreichisches Forschungszentrum, Seibersdorf. OEFZS-4366, LA-161/86 ,
- Mariotti , A. 1983 . Atmospheric nitrogen is a reliable standard for natural 15N abundance measurements . Nature , 303 ( 5919 ) : 685 – 687 .
- Gebauer , G. and Schulze , E.-D. 1991 . Carbon and nitrogen isotope ratios in different compartments of a healthy and a declining Picea abies forest in the Fichtelgebirge, NE Bavaria. . Oecologia , 87 : 198 – 207 .
- Well , R. 1992 . unpublished results