Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) G Giovannoni and J M Land and G Keir and E J Thompson and S J R Heales,Adaptation of the Nitrate Reductase and Griess Reaction Methods for the Measurement of Serum Nitrate plus Nitrite Levels,Annals of Clinical Biochemistry: International Journal of Laboratory Medicine,0004-5632,SAGE Publications,1997-03,34,2,193-198,https://cir.nii.ac.jp/crid/1364233269693164032,https://doi.org/10.1177/000456329703400212