1. : at this symposium
2. : Diploma thesis, Köln 1979, unpublished
3. Properties of Silicon Doped with Iron or Copper
4. , , , , , , , , , , : Proc. Int. Conf. on Radiation Physics of Semiconductors and Related Materials, Tbilisi, USSR, 1979, in press
5. Photo-EPR of Dislocations in silicon