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- [2] NITRATES AND NITRITES IN PLANT-TISSUES - ANALYTICAL METHODS ANNALES DE LA NUTRITION ET DE L ALIMENTATION, 1980, 34 (5-6): : 757 - 764
- [3] MICRODETERMINATION OF NITROGEN IN PLANT-TISSUES JOURNAL OF THE ASSOCIATION OF OFFICIAL ANALYTICAL CHEMISTS, 1972, 55 (01): : 1 - &
- [4] TOTAL NITROGEN ANALYSIS OF SOIL AND PLANT-TISSUES JOURNAL OF THE ASSOCIATION OF OFFICIAL ANALYTICAL CHEMISTS, 1980, 63 (04): : 770 - 777