Tandon, S. P., Bhutra, M. P. and Gupta, A. (1) “Absorption spectra of ternary complexes of rare earths”, Rev. Téc. Fac. Ing. Univ. Zulia, 7(2). Available at: http://www.produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/5125 (Accessed: 26September2025).