Jared L. Aurentz, Thomas Mach, Leonardo Robol, Raf Vandebril, David S. Watkins. Fast and Backward Stable Computation of Roots of Polynomials, Part II: Backward Error Analysis; Companion Matrix and Companion Pencil. SIAM J. Matrix Analysis Applications, 39(3):1245-1269, 2018. [doi]
Abstract is missing.