KUBAN, Vlastimil, Irena JANCAROVA, Vítězslav OTRUBA and
Viktor KANICKÝ. Determination of trace lanthanides in their pure oxides by liquid chromatography-emission spectrometry.
Analytica Chimica Acta. Amsterdam: Elsevier Science publishers, 1991, vol. 1991, 1/2, p. 21-25. ISSN 0003-2670.