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- [31] Note on the determination of exchangeable sodium in soils JOURNAL OF AGRICULTURAL SCIENCE, 1930, 20 : 355 - 358
- [32] SPECTROPHOTOMETRIC DETERMINATION OF NIOBIUM IN STEELS AND ALLOYS USING CHLOROPHOSPHONAZO-III ANALES DE QUIMICA, 1978, 74 (04): : 589 - 594