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PACE, G. M., MACKOWN, C. T., & VOLK, R. J. (1982). MINIMIZING NITRATE REDUCTION DURING KJELDAHL DIGESTION OF PLANT-TISSUE EXTRACTS AND STEM EXUDATES - APPLICATION TO N-15 STUDIES. PLANT PHYSIOLOGY, 69(1), 32–36. https://doi.org/10.1104/pp.69.1.32