Samarium, europium, gadolinium, terbium, holmium, erbium, thulium, ytterbium, lutecium and their oxides. Spectral method of determination of impurities in oxides of rare-earth elements
Power line communication apparatus and systems on low-voltage electrical installations in the frequency range 1.6 MHz to 30 MHz. Part 2-1. Residential, commercial and industrial environment. Immunity requirements
