Sixteenth-Order Steffensen-Ostrowski Approach for Nonlinear Problems with ​A​pplications in Celestial, Predator-Prey and Neural Activation​. Eur. J. Pure Appl. Math. 2025, 18 (2), 5822. https://doi.org/10.29020/nybg.ejpam.v18i2.5822.