1. R. Booth et al., Nucl. Instr. Meth. 145 (1977) 25.
2. J. Pivarč et al., Report INDC(CSR)-2/L, IAEA, Vienna, 1980.
3. T. Sztaricskai, Report ZfK-459, Rossendorf, 1981, p. 176.
4. U. Jahn and J. Dietrich, Proc. 14th Int. Conference, Gaussig, 1984.
5. E. Paffrath et al., Proc. 14th Int. Conference, Gaussig, 1984.