Lanthanum, neodymium, gadolinium, dysprosium, yttrium, and their oxides. Method of determination of impurities as oxides of praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium
Unified system of corrosion and ageing protection. Corrosion protection of wares from non-ferrous metal alloys by diffusion treatment with zinc. General requirements for flow process
