1. The permeability of coal to air or gases, and the solubilities of different gases in coal;Graham;Trans. Inst. Min. Eng.,1916
2. The permeability of coal to gases;Graham;Trans. Inst. Min. Eng.,1918
3. Experimental results of coal permeability tests;Huang;Min. Eng.,1962
4. A Laboratory Investigation into the Permeability of Coal;Jones,1969
5. Reduction in permeability with overburden pressure;Fatt;Trans. AIME, Petroleum Branch,1952