D. S. Krstic, P. B. Nikolic, Z. J. Popovic, and M. C. Stefanović, “First and Second Order Characteristics of a Wireless Three-hop Relay Channel with the Presence of Rayleigh Fading”, JTIT, vol. 80, no. 2, pp. 36–44, Jun. 2020, doi: 10.26636/jtit.2020.144020.