1. Marsh, D. M., “Stress Concentration at Crystal Surfaces and the Embrittlement of Sodium Chloride,” Phil. Mag., 5 (1960), 1197.
2. Stokes, R. J., Johnston, T. L. and Li, C. H., “Environmental Effects on the Mechanical Properties of Ionic Solids with Particular Reference to the Joffe Effect,” Trans. AIME, 218 (1960), 655.
3. Class, W. H., Machlin, E. S. and Murray, G. T., “Embrittlement of NaCl by Surface Compound Formation,” Trans. AIME, 221 (1961), 769.
4. Gorum, A. E., Parker, E. R. and Pask, J. A., “Effect of Surface Conditions on Room Temperature Ductility of Ionic Crystals,” J. Am. Cer. Soc, 41 (1958), 161.
5. Westwood, A. R. C., “Effect of Coatings on Lithium Fluoride Crystals,” Phil. Mag., 5 (1960), 981.