An optimized Steffensen-type iterative method with memory associated with annuity calculationFuad W. Khdhr, Fazlollah Soleymani, Rostam K. Saeed and Ali AkgülEur. Phys. J. Plus, 134 4 (2019) 146DOI: https://doi.org/10.1140/epjp/i2019-12665-3