SEARCH Articles Figures Tables A) determinations As purity Determination of as Determination of purity Determination of rare earth Earth lanthanide Earth oxidation High oxidation High-purity High-purity rare-earth oxides Lanthanide oxide Lanthanide rare earths Lanthanides, determination Oxidation determination Purity determinations Purity determining Rare earth oxides Rare earths, determination Rare oxides T determination T oxidation Trace determination Trace of lanthanides