GHASSAN E. ARIF; SURA Y. JAAFAR; SHYMAA M. ABDULLAH. Using Least squares methods and nonlinear regression Methods to Calculate the Approximate Value of Ionicity in Terms of the Energy Gap. Tikrit Journal of Pure Science, [S. l.], v. 24, n. 5, p. 97–104, 2019. DOI: 10.25130/tjps.v24i5.424. Disponível em: https://tjpsj.org/index.php/tjps/article/view/424. Acesso em: 17 jun. 2025.