1. Bailey, S. L. (1988). PhD thesis, University of Bristol.
2. Batstone, J.L. and Steeds, J.W. (1985). In Microscopy of Semiconducting Materials 1985, Conf. Series No. 76, eds Cullis, A.G. and Holt, D.B., Institute of Physics, Bristol, pp. 383–388.
3. Berger, S.D. and Brown, L.M. (1984). In Electron Microscopy and Analysis 1983, Conf. Series No. 68, ed. Doig, P., Institute of Physics, Bristol, pp. 115–118.