“UV-VIS Absorption Spectral Studies of N, N′-Bis(salicylidene)ethylenediamine (Salen) in Different Solvents”. Iraqi Journal of Science, vol. 60, no. 2, Feb. 2019, pp. 204-10, https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/632.