1. Cramp, J.L., Duldig, M.L., Flückiger, E.O., Humble, J.E., 1993. The GLE of 29 September 1989. 25th International Cosmic Ray Conference (Calgary). 3, pp. 47–50
2. The October 22, 1989 solar cosmic ray enhancement: an analysis of the anisotropy and spectral characteristics;Cramp;J. Geophys. Res.,1997
3. The ionizing radiation in supersonic transport flights;Foelsche,1965
4. Recommendations of The International Commission on Radiological Protections,1991
5. ICRU Report 71, 1997. Conversion coefficients for use in Radiological Protection against External Radiations, Joint Report of the ICRU/ICRP task group. International Commission of Radiation Units and Measurements, Bethesda, MD