1. Baerg AP (1973) The efficiency extrapolation method in coincidence counting. Nucl Instr Methods 112:143?150
2. Christmas P (1982a) International Committee for Radionuclide Metrology ? ICRM. Proceedings of the Third World Congress of Nuclear Medicine and Biology, Aug. 22-Sept. 2, 1982, Paris, pp 2951?2954
3. Christmas P (1982b) Activities of the International Committee for Radionuclide Metrology. Proceedings of the Third World Congress of Nuclear Medicine and Biology, Aug. 22?Sept. 2, 1982, Paris, pp 2948?2950
4. Commission of the European Communities (1984) Council directive. Official J Eur Communities L265/2 5.10.1984
5. Coursey BM (1986) Calibration of ionization chambers for use in nuclear medicine. Trans Am Nucl Soc 53:17?23