1. New interpretation of the meaning of the exponent “m” in the gravity drainage theory for continuously steamed wells;Butler;AOSTRA Journal of Research,1985
2. Butler, R.M., 1991. Thermal Recovery of Oil and Bitumen. Prentice-Hall, Englewood Cliffs, NJ, 528pp.
3. SAGD comes of age;Butler;Journal of Canadian Petroleum Technology,1998
4. The gravity drainage of steam-heated heavy oil to parallel horizontal wells;Butler;Journal of Canadian Petroleum Technology,1981
5. Theoretical studies on the gravity drainage of heavy oil during in-situ steam heating;Butler;Canadian Journal of Chemical Engineering,1981