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- [2] SPECTROPHOTOMETRIC DETERMINATION OF NIOBIUM BY FERRON INDIAN JOURNAL OF CHEMISTRY, 1973, 11 (12): : 1327 - 1328
- [4] SPECTROPHOTOMETRIC DETERMINATION OF NIOBIUM IN ALLOYS INDUSTRIAL LABORATORY, 1958, 24 (08): : 1037 - 1041
- [5] INVESTIGATION INTO CONDITION FOR EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF NIOBIUM SODIUM PYROLLIDINE DITHIOCARBAMATE ZAVODSKAYA LABORATORIYA, 1972, 38 (12): : 1431 - 1433
- [6] SPECTROPHOTOMETRIC DETERMINATION OF NIOBIUM IN PLATINUM-NIOBIUM ALLOYS ZEITSCHRIFT FUR ANALYTISCHE CHEMIE FRESENIUS, 1969, 244 (04): : 235 - &
- [8] SPECTROPHOTOMETRIC DETERMINATION OF NIOBIUM WITH SALICYLIC ACID FRESENIUS ZEITSCHRIFT FUR ANALYTISCHE CHEMIE, 1971, 253 (05): : 351 - &
- [9] SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION OF NIOBIUM AND TUNGSTEN SPECTROCHIMICA ACTA, 1958, 12 (04): : 388 - 388
- [10] REZARSON AN A REAGENT FOR SPECTROPHOTOMETRIC DETERMINATION OF NIOBIUM ZHURNAL ANALITICHESKOI KHIMII, 1971, 26 (09): : 1782 - +