1. Horizontal Wells;Aguilera,1991
2. Thermal recovery of oil and bitumen;Butler,1998
3. SAGD comes of age;Butler;JCPT,1998
4. The Gravity Drainage of Steam-Heated Heavy Oil to Parallel Horizontal Wells;Butler,1980
5. Theoretical studies on the gravity drainage of heavy oil during in-situ steam heating;Butler;The Canadian Journal of Chemical Engineering,1981