M. M. El-ajaily , A. A. Maihub , K. M. Khalifa and R. M. El-Ferjany. 2017. “Metal Chelates of the Amino Acid Schiff Bases: Preparation and `Spectroscopic Investigation”. Journal of Pure & Applied Sciences 16 (1). https://doi.org/10.51984/jopas.v16i1.33.