M. C. Herrera Ramos, L. M. Capacho Valbuena, and A. Londoño Cano, “Modular communication systems based on spread spectrum modulation techniques using GNU radio”, rev.ing.univ.Medellin, vol. 24, no. 47, pp. 1–21, Jul. 2025, doi: 10.22395/rium.v24n47a1.