Islam, Nazmul, and Dulal C. Ghosh. 2010. “Evaluation of Global Hardness of Atoms Based on the Commonality in the Basic Philosophy of the Origin and the Operational Significance of the Electronegativity and the Hardness. Part I. The Gordy’s Scale of Electronegativity and the G.H”. European Journal of Chemistry 1 (2):83-89. https://doi.org/10.5155/eurjchem.1.2.83-89.26.