1. J. W. Harris, J.J. Gurney in “The Properties of Diamond”, ed. J.E. Field (Academic, London, 1979)
2. N.V. Sobolev, E.S. Efimova, L.N. Pospelova, Geol.Geofiz 1981 (12) 25.
3. H.G.Maguire, I.E.G.Morrison, (to be published).
4. G. Davies, “Diamond” (Adam Hilger Ltd, Bristol 1981) p100.
5. R.J.Wedlake in “The Properties of Diamond”, as in reference /1/.