1995 P series : radiowave propagation: ITU-R recommendations (new and revised as of 21 October 1995) / International Telecommunication Union
1994 PI series : propagation in ionized media: ITU-R recommendations / ITU-R
Radiowave propagation : supplement 1 to volume 2000 P Series: parts 1 and 2 / International Telecommunication Union
Study groups 1, 12, 5, 6, 7 : questions of the CCIR, 1990: volume XV-1 / International Telecommunication Union.International Radio Consultative Committee