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- [38] DETERMINATION OF NITROGEN IN NIOBIUM BY VOLATILIZATION OF AMMONIA FROM MOLTEN ALKALI INDUSTRIAL LABORATORY, 1968, 34 (12): : 1740 - &
- [39] DETERMINATION OF OXYGEN AND NITROGEN IN NIOBIUM BY SPARK SOURCE MASS SPECTROGRAPHY RECHERCHE AEROSPATIALE, 1967, (121): : 33 - &
- [40] DETERMINATION OF OXYGEN AND NITROGEN IN NIOBIUM BY SPARK SOURCE MASS SPECTROGRAPHY CHIMIE ANALYTIQUE, 1968, 50 (07): : 369 - &