GOST 25278.17-1987 Alloys and foundry alloys of rare metals. Spectral (with induction hign-frequency plasma) method for determination of elements and impurities in alloys on the base of niobium
1987GOST 25278.17-1987 Alloys and foundry alloys of rare metals. Spectral (with induction hign-frequency plasma) method for determination of elements and impurities in alloys on the base of niobium