1. For a recent review on Mössbauer isomer shift see: Mössbauer isomer shift, ed. by G.K. Shenoy and F.E. Wagner (North-Holland, Amsterdam, 1978).
2. G. Weyer, A. Nylandsted-Larsen, B.I. Deutch, J.U. Andersen and E. Antoncik, Hyp. Int. 1 (1975) 93.
3. G. Weyer, A. Nylandsted-Larsen, B.I. Deutch, E. Antoncik and H. Loft Nielsen, Radiation effects in semiconductors, 1976, ed. N.B. Urli and J.W. Corbett, Inst. Phys. Conf. Ser. No. 31 (London, 1977) p. 491.
4. E. Antoncik, Proc. Int. Conf. on lattice defects in semiconductors, Freiburg, 1974. Inst. Phys. Conf. Ser. No. 23 (London, 1975) p. 565.
5. E. Antoncik, Hyp. Int. 1 (1976) 329.