1. B.D. Dunlap and G.M. Kalvius, in: Mössbauer isomer shifts, ed. G.K. Shenoy and F.E. Wagner (North-Holland, Amsterdam, 1978) p. 45.
2. A recent review on Mössbauer IS can be found in Mössbauer isomer shifts (see above).
3. E. Antoncik, in: Electrons in crystalline solids (IAEA, Vienna, 1973) p. 461.
4. G. Weyer, A. Nylandsted-Larsen, B.I. Deutch, J.U. Andersen and E. Antoncik, Hyp. Int. 1 (1975) 93. G. Weyer, J.W. Petersen and S. Damgaard, Hyp. Int. 10 (1981) 775.
5. E. Antoncik, Proc. Int. Conf. on lattice defects in semiconductors, Freiburg, 1974. Inst. Phys. Conf. Ser. No. 23 (London, 1975) p. 565.