1. Relationship of mechanical, index, and mineralogic properties of coal measure rock;Barbour,1979
2. The physical and mechanical properties of the fell sandstones, Northumberland, England;Bell;Engineering Geology,1978
3. Effects of slaking on the strength of clay shales: a critical state approach;Botts,1998
4. Evaluation of empirical methods for measuring the uniaxial compressive strength of rock;Cargill;International Journal of Rock Mechanics and Mining Sciences,1990
5. Durability-plasticity classification of shales and indurated clay;Deere,1971