I. J. Al-Nuri, S. T. Sulaiman, and L. M.N. Saleem, “Study of Charge Transfer Complexes of salicylidene aliphatic amines with Eu(fod)3 in cyclohexane by U. V. spectroscopy”, RSCI, vol. 16, no. 8, pp. 80–87, Jun. 2005.