E. Ion, M. Calinescu, I. Serban, D. Donescu, E. Barna, T. Ionescu, A. Meghea and A. Emandi. Synthesis and fluorescent properties of Eu(III), Tb(III), Gd(III), Sm(III), Dy(III), Ho(III) azo-polymer complexes containing 1,10-phenanthroline and alylaceto-acetate as ligands//Nonlinear Optics, 2001, 27, 423-437
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https://hero.epa.gov/reference/6607842/