1. Johnson Matthey Chemicals Ltd., Royston, Herts., U.K.
2. The preparation of high purity epitaxial InP
3. Proc. Third Interm. Symp. on GaAs;Hales,1971
4. R.C. Clarke, L.L. Taylor and W.H.E. Wilgoss, awaiting publication.
5. Solid State Res. Rept.;Reed,1969