1. Special Technical Publication No 381,1965
2. Der Metallische Zustand;Kramer;Vandenhoeck und Ruprecht,1950
3. On the Action Exerted by Certain Metals and Other Substances on a Photographic Plate;Russell,1897
4. Liquid Crystals: A New Tool for NDT;Davis;Research/Development,1967
5. Acoustic Emission Under Applied Stress;Schofield,1961