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- [4] THE DETERMINATION OF NITRATES IN COLORED SOIL EXTRACTS CANADIAN JOURNAL OF RESEARCH SECTION B-CHEMICAL SCIENCES, 1949, 27 (02): : 76 - 80
- [5] Accurate determination of soil nitrates by phenol disulfonic acid method JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY-US, 1919, 11 (05): : 213 - 218