Cira, C. M., and O. Cira. “Start Iteration for Ezquerro-Hernández Method”. Rev. Anal. Numér. Théor. Approx., vol. 37, no. 2, Aug. 2008, pp. 133-42, https://ictp.acad.ro/jnaat/journal/article/view/2008-vol37-no2-art5.