1. Briddon , P. R. and Jones , R. Proceedings of the Second International Conference on New Diamond Science and Technology . 1991 , Washington . Edited by: Meissier , R. , Glass , J. T. , Butler , J. E. and Roy , T. pp. p. 63 Pittsburgh : Materials Research Society .
2. Briddon , P. R. , Jones , R. and Heggie , M. I. Proceedings of the 16th International Conference on Defects in Semiconductors . 1991 . Pennsylvania : Lehigh University .
3. Davies , G. , DeLeo , G. G. and Stavola , M. , eds. Trans Tech Publications .
4. Collins , A. T. , Haynes , P. , Mainwood , A. and Woods , G. S. Diamond Conference . 1991 . (unpublished)