1. R.G. Macaulay-Newcombe and D.A. Thompson, these Proceedings (REI-83), p. 176.
2. D. Grasse, J. Peisl and B. Dorner, these Proceedings (REI-83), p. 183.
3. K. Tanimura, T. Tanaka and N. Itoh, these Proceedings (REI-83), p. 187.
4. L.E. Halliburton, M.G. Jani and R.B. Bossoli. these Proceedings (REI-83), p. 192.
5. E.J. Friebele et al., these Proceedings (REI-83), p. 355.