1. ‘Radio meterological data’, 15, December, 1989 CCIR XVIIth Plenary Assembly, Dusseldorf, 1990; Document 5/1020
2. ‘Propagation data and prediction methods required for Earth-space telecommunication systems’, 15, December, 1989 CCIR XVIIth Plenary Assembly Dusseldorf 1990, Document 5/1042