Salazar-Flórez, E. E., J. E. Mora-Moreno, and C. R. Correa-Cely. “Design of Optimum Electromagnetic Absorbers in the Wireless Communications Range”. Ingenieria Y Universidad, vol. 18, no. 1, May 2014, pp. 17-42, doi:10.11144/Javeriana.iyu18-1.doea.