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| GOST 23862.10-79 |
| Rare-earth metals and their oxides. Chemical-spectral methods of determination of impurities of vanadium, tungsten, iron, cobalt, manganese, copper, molybdenum, nickel, niobium, lead, tantalum, titanium and chromium |
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| GOST 23862.13-79 |
| Lanthanum, neodymium, gadolinium, dysprosium, yttrium and their oxides. Method of determination of impurities as oxides of praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium |
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