Kashpirovskii, A. I., & Torba, S. M. (2008). Characterization of the rate of convergence of one approximate method for the solution of an abstract Cauchy problem.
Ukrains’kyi Matematychnyi Zhurnal,
60(4), 557–563.
https://umj.imath.kiev.ua/index.php/umj/article/view/3175