Gómez-Tornero, José Luis, et al. “Interactive Lab to Learn Radio Astronomy, Microwave & Antenna Engineering at the Technical University of Cartagena (Spain)”. International Journal of Online and Biomedical Engineering (iJOE), vol. 7, no. 1, Jan. 2011, pp. pp. 10-18, doi:10.3991/ijoe.v7i1.1523.