Capen; Clap; Campbell (June 1971). "Competitive Bidding in High-Risk Situations". Journal of Petroleum Technology. 23 (6). Society of Petroleum Engineers: 641 to 643. doi:10.2118/2993-PA. ISSN0149-2136.
Capen; Clap; Campbell (June 1971). "Competitive Bidding in High-Risk Situations". Journal of Petroleum Technology. 23 (6). Society of Petroleum Engineers: 641 to 643. doi:10.2118/2993-PA. ISSN0149-2136.