Dr. Abd-El-Hamid Bensafi, Associate Professor, Department of Chemistry and Physics, Faculty of Sciences, Abou Bekr Belkaid University of Tlemcen, Algeria
E-mail: aeh.bensafi@gmail.com

Dr. S. BALAMURUGAN, Associate Professor, Advanced Nanomaterials Research Laboratory, Department of Nanotechnology, Noorul Islam Centre for Higher Education, INDIA
E-mail: scandium.chemistry@gmail.com

Dr. Martin A. Masuelli, Coordinador Área de Química Física, Departamento de Química, Facultad de Química, Bioquimica y Farmacia, Universidad Nacional de San Luis, Argentina
E-mail: masuelli@unsl.edu.ar