A practical observer for state and sensor fault reconstruction of a class of fractional‐order nonlinear systemsHassen Ahmed, Assaad Jmal and Abdellatif Ben MakhloufEur. Phys. J. Spec. Top., 232 14-15 (2023) 2437-2443DOI: https://doi.org/10.1140/epjs/s11734-023-00938-x