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3. The H-Nb (Hydrogen-Niobium) and D-Nb (Deuterium-Niobium) Systems;Smith;Bull. Alloy Phase Dia.,1983
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5. I. Barin Thermochemical Data of Pure Substances, Part I (VCH Verlagsgesellschaft mbH, D-6940 Weinheim, Federal Republic of Germany, 1989)