1. The daily intake of 234,235,238U, 228,230,232Th and 226,226Ra by New York City residents;Fisenne;Hlth Phys.,1987
2. Hong Kong Trade Statistics Imports, Exports/Reexports;Hong Kong Census and Trade Statistics Department,1990
3. Hong Kong Annual Digest of Statistics (1991);Hong Kong Census and Trade Statistics Department,1991
4. Publication 23: Report of the Task Group on Reference Man;ICRP, International Commission on Radiological Protection,1975
5. Publication 30: Limits for Intakes of Radionuclides by Workers;ICRP, International Commission on Radiological Protection,1980