Ahmad, T. S. ., Hussain, T. . and Sultan, M. A. . (2021) “Mass Spectrum and Decay Constants of Heavy Quarkonia: Mass Spectrum and Decay Constants of Heavy Quarkonia”, Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, 58(2), pp. 73–83. doi: 10.53560/PPASA(58-2)612.