1994 PN series : propagation in non-ionized media: ITU-R recommendations / ITU-R
Radiowave propagation : supplement 1 to volume 2000 P Series: parts 1 and 2 / International Telecommunication Union
Commission d'études 1, 12, 5, 6, 7 : questions du CCIR, 1990: volume XV-1 / International Telecommunication Union
Study groups 8 : questions of the CCIR, 1990: volume XV-2 / International Telecommunication Union