Verma, R.S., and G.K. Joshi. “Electronic Spectral Parameters of the Saturated Solutions of Some Amino Acids and Some Bioactive N-Heterocyclic Compounds Doped With Pr(III) Ion”. Asian Journal of Chemistry 13, no. 2 (March 30, 2010): 704–708. Accessed June 30, 2024. https://asianpubs.org/index.php/ajchem/article/view/22653.