- F. Leulmi, Y. Ferdi, “Improved Digital Rational Approximation of the Operator sα Using Second-Order s-to-z Transform and Signal Modeling,” Circuits, Systems, and Signal Processing, vol.34, no.6, pp 1869-1891 /2015.

- C. Mekhnache, Y. Ferdi, “Using New Hybrid Integrators to Design IIR Fractional-Order Integrators via Impulse Invariance Method,” Circuits, Systems, and Signal Processing, vol. 33, no.2, pp 643-653 /2014.

- M. R. Lakehal, Y. Ferdi, and A. Taleb-Ahmed, “On the self-similarity of 1/ f b sequences synthesized by recursive filtering,” Computers & Electrical Engineering, vol. 38, no.2, pp. 282–293 /2012.

- Y. Ferdi, “some applications of fractional order calculus to design digital filters for biomedical signal processing,” Journal of Mechanics in Medicine and Biology, vol.12, no. 2 /2012.