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Wald, Abraham. (1943). A Method of Estimating Plane Vulnerability Based on Damage of Survivors. Statistical Research Group, Columbia University. CRC 432 — reprint from July 1980Archived 2019-07-13 at the Wayback Machine. Center for Naval Analyses.
Sandberg, Anders. "Observer selection effects"(PDF). Future of humanity Institute, University of Oxford. Archived(PDF) from the original on 5 July 2019. Retrieved 17 November 2024.