AL-Agealy, H. J. M. “Theoretical Study of the Effect of the Coupling Constant Strength on the Photons Rate Yield for Quark Gluon Interaction”. University of Thi-Qar Journal of Science, Vol. 4, no. 4, July 2019, pp. 66-70, https://www.jsci.utq.edu.iq/index.php/main/article/view/668.