Ercag, Ayse, et al. “Nickel(II) and Copper(II) Complexes of Schiff BaseDerived from Isatin With 4-Ethylaniline”.
Asian Journal of Chemistry
, vol. 18, no. 2, Mar. 2010, pp. 1183-90, https://asianpubs.org/index.php/ajchem/article/view/21106.