Collect. Czech. Chem. Commun.
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https://doi.org/10.1135/cccc19772871
Spectrophotometric study of the complexation of Pr(III) with 4-(2-thiazolylazo)resorcinol and 1-(2-thiazolylazo)-2-naphthol-3,6-disulphonic acid
J. Vošta and J. Havel