1. Plessey Radar, Addleton, UK‘Technical manual on ILS’, 1972 TP-3140
2. US Federal Aviation Administration‘Installation instruction for ILS’, 1969 DOT/FAA 6750.6A
3. ‘Earth cover and contour effects on image glidepaths’, Final Report, EER 5-1, Ohio University, Avionics Research Group, 1968 Contract FA 64WA 5060
4. ‘ILS glideslope performance prediction’, Cambridge, Transportation Systems Centre, MA, USA, 1974