1. Orientation index determination of flint clay using an X-ray diffractometer technique;Bennetts;S. Afr. Geol. Survey Annls,1963
2. Compressibility; elastic constants;Birch,1966
3. Mechanical anisotropies of laminated sedimentary rocks;Chenevert;Soc. Petrol. Engng J.,1965
4. An Introduction to Applied Anisotropic Elasticity;Hearmon,1961
5. Ground pressure and plate-statics tests on the elastic properties of coal-measure rocks from upper-Silesian mines;Hermann;Beitr. angew. Geophys.,1937