1. W. Gmelin, D. Gupta and W. Häfele, On safeguard in the field of peaceful application of nuclear energy, KFK 800 (Kernforschungszentrum Karlsruhe).
2. W. Häfele, W. Gmelin, D. Gupta, J. Larissa and H. Winter, Safeguard system studies and fuel cycle analysis, KFK 900 (Kernforschungszentrum Karlsruhe).
3. D. Gupta, W. Gmelin, R. Kraemer, K. Richter and V. Schneider, Safeguard measures and efforts in conceptual fabrication plants for uranium and plutonium containing fuel elements, KFK 910 (Kernforschungszentrum Karlsruhe).
4. Pulsed neutron method for non-destructive and simultaneous determination of the 235U and 239Pu contents of irradiated and non-irradiated reactor fuel elements