Team, S. “Asymptotically and Statistically Equivalent Functions Defined on Amenable Semigroups: Fatih Nuray, B.E. Rhoades”. Thai Journal of Mathematics, vol. 11, no. 2, Aug. 2013, pp. 303-11, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/378.