Rai, H., Rai, B. and Thakur, R. (2010) “Studies on Spectral Properties of Co(II), Ni(II) and Cu(II) Complexes with Ninhydrine and Ninhydrine Oximes”, Asian Journal of Chemistry, 13(1), pp. 277–282. Available at: https://asianpubs.org/index.php/ajchem/article/view/22564 (Accessed: 14 December 2025).