GOST 23862.8-1979 Lanthanum, cerium, ytterbium, lutecium, yttrium and their oxides. Chemical-spectral method of determination of impurities in oxides of rare earth elements
GOST 9293-1974 Gaseous and liquid nitrogen. Specifications
GOST 23862.8-1979 history
1979GOST 23862.8-1979 Lanthanum, cerium, ytterbium, lutecium, yttrium and their oxides. Chemical-spectral method of determination of impurities in oxides of rare earth elements