1. Proc. First Ann. Symp. on Safeguards and Nuclear Material Management. European Safeguards Research and Development Association (ESARDA);Bortels,1979
2. Emission probabilities for the 5.449-MeV alpha particles and 241-keV gamma rays in the 224Ra-220Rn decay
3. Proc. Sixth Ann. Symp. on Safeguards and Nuclear Material Management. European Safeguards Association (ESARDA);Bortels,1984