The brightness and spatial distributions of terrestrial radio sources 由 Offringa, A, Bruyn, A, Zaroubi, S, Koopmans, L, Wijnholds, S, Abdalla, F, Brouw, W, Ciardi, B, Iliev, I, Harker, G, Mellema, G, Bernardi, G, Zarka, P, Ghosh, A, Alexov, A, Anderson, J, Asgekar, A, Avruch, I, Beck, R, Bell, M, Bell, MR, Bentum, M, Best, P, Bîrzan, L, Breitling, F