Lanthanum, neodymium, gadolinium, dysprosium, yttrium, and their oxides. Method of determination of impurities as oxides of praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium
State system for ensuring the uniformity of measurements. State verification schedule for means of LTEC measurements of solids from 0,01х10 -6 to 100х10 -6 К -1 substance in temperature range from 90 to 3000 K
