Pacheco, C., Duarte-Mermoud, M. A., Aguila-Camacho, N., & Castro-Linares, R. (2026). Fractional-order State Observers for Integer-order Linear Systems. Journal of Applied Nonlinear Dynamics, 6(2), 251-264. https://doi.org/10.5890/JAND.2017.06.010