1. Akima , H. RF protection ratio study for AM broadcasting Boulder, Colo. 1966
2. CCIR CCIR interim method for estimating sky-wave field strength and transmission loss at frequencies between the approximate limits of 2 and 30 MHz Geneva 1970
3. CCIR Subjective assessment of sound quality XV Plenary Assembly X 215 Geneva 1982
4. CCIR Protection ratios in LF, MF and HF broadcasting XV Plenary Assembly X 7 11 Geneva 1982
5. CCIR Fading allowances in HF broadcasting XVI Plenary Assembly X 67 Geneva 1986