GOST 25278.11-1982 Alloys and foundry alloys of rare metals. Spectral method for determination of silicon, iron, aluminium, titanium, calcium in alloys on niobium base
1982GOST 25278.11-1982 Alloys and foundry alloys of rare metals. Spectral method for determination of silicon, iron, aluminium, titanium, calcium in alloys on niobium base