1. Permeability of idealized fractured rock;Parsons;Soc. Pet. Engrs. J.,1966
2. Permeability of porous media to liquids and gases;Klinkenberg;API Drill. & Prod. Pract.,1941
3. Variations in permeability of coal;Patching,1965
4. Investigation of the relationship between coal and the gas contained in it;Gunther,1965