Herzberger, J. “Computational Aspects of Some Iterative Methods for Bounding the Inverse of a Matrix”. Anal. Numér. Théor. Approx., vol. 16, no. 1, Feb. 1987, pp. 41-46, https://ictp.acad.ro/jnaat/journal/article/view/1987-vol16-no1-art6.