Şoltuz, Ştefan M. “New Technique for Proving the Equivalence of Mann and Ishikawa Iterations”. Rev. Anal. Numér. Théor. Approx., vol. 34, no. 1, Feb. 2005, pp. 103-8, https://ictp.acad.ro/jnaat/journal/article/view/2005-vol34-no1-art11.