1. Raal, F. A., ‘The special research project; 25 years later’, Proceedings of the Diamond Conference, Cambridge (1975)
2. ‘Magnetic resonance – A non-destructive probe of gemstones’;Hutton;Journal of Gemmology,1979
3. ‘Pearl identification: some laboratory experiments’;Schiffmann;Journal of Gemmology,1971
4. ‘Fingerprinting diamonds by X-ray topography’;Lang;Industrial Diamond Review,1976
5. ‘X-ray topography of a natural emerald and a synthetic emerald’;Schubnel;Journal of Gemmology,1971