Rhoades, B. E., and c{S}tefan M. c{S}oltuz. “The Equivalence of Mann Iteration and Ishikawa Iteration for a Lipschitzian $ \psi $- Uniformly Pseudocontractive and $ \psi $- Uniformly Accretive Maps”. Tamkang Journal of Mathematics, vol. 35, no. 3, Sept. 2004, pp. 235-46, doi:10.5556/j.tkjm.35.2004.204.