Sergio Amat Miguel Ángel Hernández-Verón Natalia Romero Álvarez A modified Chebyshev's iterative method with at least sixth order of convergence. 164-174 2008 206 Appl. Math. Comput. 1 https://doi.org/10.1016/j.amc.2008.08.050 db/journals/amc/amc206.html#AmatHR08