Lanthanum, neodymium, gadolinium, dysprosium, yttrium, and their oxides. Method of determination of impurities as oxides of praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium
Electrical apparatus for use in the presence of combustible dust. Part 2. Test methods. Section 1. Methods for determining the minimum ignition temperatures of dust
