Garcia, C.R.; Rumpf, R.C.; Tsang, H.H.; Barton, J.H.: 'Effects of extreme surface roughness on 3D printed horn antenna', Electronics Letters, 2013, 49, (12), p. 734-736, DOI: 10.1049/el.2013.1528 IET Digital Library, https://digital-library.theiet.org/;jsessionid=4crlgmj3tn3m.x-iet-live-01content/journals/10.1049/el.2013.1528