1. Horizontal wells for the recovery of oil, gas and bitumen;Butler,1994
2. Production performance analysis of horizontal drainage wells for the degasification of coal seams;Ertekin;J. Petro. Tech.,1988
3. Adsorption of methane, nitrogen, carbon dioxide and their mixtures on wet Tiffany coal;Fitzgerald;Fuel,2005
4. Measurement of rock properties in coal for coalbed methane production, paper no. SPE 22909 presented at the 66th SPE Annual Technical Conference and Exhibition, Dallas, Texas, October 6–9;Gash,1991
5. A comparative evaluation of vertical and horizontal drainage wells for the degasification of coal seams;King,1984