Rossafi, Mohamed, et al. “Generalized Rational $ \alpha_{\ast}- $ Contraction in $ C^{\ast}- $algebra-Valued B-Metric Spaces”. Jurnal Matematika, Statistika Dan Komputasi, vol. 19, no. 1, Sept. 2022, pp. 33-50, doi:10.20956/j.v19i1.21301.