1. Space Radiation Study Panel, Life Sciences Committee (1967) Radiobiological Factors in Manned Spaceflight. Natl Acad Sci, Washington, DC
2. Space Science Board, Radiobiological Advisory Panel, Committee on Space Medicine (1970) Radiation Protection Guides and Constraints for Space-mission and Vehicle-design Studies Involving Nuclear Systems. Natl Acad Sci, Washington, DC
3. Space Science Board, Radiobiological Advisory Panel, Committee on Space Biology and Medicine (1973) HZE-Particle Effects in Manned Spaceflight. Natl Acad Sci, Washington, DC
4. Lett JT, Cox AB, Keng PC, Lee AC, Su CM, Bergtold DS (1980) Life Sci Space Res XVIII:131?142
5. Keng PC, Lett JT (1981) Int J Radiat Biol 39:655?664