document: Comments on some recent methods for the simultaneous determination of polynomial zeros In this note we give some comments on the recent results concerning a simultaneous method of the fourth-order for finding complex zeros in circular interval arithmetic . The main discussion is directed to a rediscovered iterative formula and its modification , presented recently in Sun and Kosmol , -LRB- 2001 -RRB- . The presented comments include some critical parts of the papers Petkovic , Trickovic , Herceg , -LRB- 1998 -RRB- and Sun and Kosmol , -LRB- 2001 -RRB- which treat the same subject
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