The point symmetric single step procedure PSS1 has R-order of convergence at least 3. This procedure is modified by adding another single-step, which is the third step in PSS1. This modified procedure is called the point zoro symmetric single-step PZSS1. It is proven that the R-order of convergence of PZSS1 is at least 4 which is higher than the R-order of convergence of PT1, PS1, and PSS1. Hence, computational time is reduced since this procedure is more efficient for bounding simple zeros simultaneously.
"The Point Zoro Symmetric Single-Step Procedure for Simultaneous Estimation of Polynomial Zeros." J. Appl. Math. 2012 1 - 11, 2012. https://doi.org/10.1155/2012/709832