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- [7] Establishment of traceability of ammonium nitrogen determination in wastewater Analytical and Bioanalytical Chemistry, 2004, 378 : 1243 - 1250
- [8] METHODS OF DETERMINATION OF NITROGEN ISOTOPE RATIO OF NATURAL GASES ERDOL UND KOHLE ERDGAS PETROCHEMIE VEREINIGT MIT BRENNSTOFF-CHEMIE, 1971, 24 (02): : 76 - &
- [9] CONTINUOUS DETERMINATION OF NITROGEN OXIDES IN AIR AND EXHAUST GASES AIR AND WATER POLLUTION, 1964, 8 (8-9): : 455 - 463
- [10] MASS-SPECTROMETRIC DETERMINATION OF NITROGEN IN TECHNOLOGICAL GASES INDUSTRIAL LABORATORY, 1984, 50 (12): : 1170 - 1172