H.R.  Sahebi, S.  Ebrahimi, 
    A Δ-Convergence Theorem in CAT (0) Spaces,
    Journal of Modern Mathematics and Statistics,
    Volume 6,Issue 3,
    2012,
    Pages 23-26,
    ISSN 1994-5388,
    jmmstat.2012.23.26,
    (https://makhillpublications.co/view-article.php?doi=jmmstat.2012.23.26)
    Abstract: In this study, researchers introduce a new iterative process 
  for two non-expansive map satisfying the condition (II) in CAT (0) space and 
  establish Δ-convergence theorem for the proposed process under condition.
    Keywords: Non-expansive mapping;CAT (0) spaces;fixed point;Hilbert space;-convergence;Iran