Determination of nitrogen-15 at sub-microgram levels of nitrogen using automated continuous-flow isotope ratio mass spectrometry

The Analyst ◽  
1989 ◽  
Vol 114 (12) ◽  
pp. 1655 ◽  
Author(s):  
Nicholas J. P. Owens ◽  
Andrew P. Rees
2005 ◽  
Vol 77 (13) ◽  
pp. 4027-4033 ◽  
Author(s):  
Orfan Shouakar-Stash ◽  
Shaun K. Frape ◽  
Robert J. Drimmie

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