1. Amos, D. E. and Daniel, S. L. (1971) Tables of Percentage Points of Standardized Pearson Distributions. Research Report #SC-RR-710348, NTIS, Virginia, USA.
2. Aggregating Subjective Forecasts: Some Empirical Results
3. Expert judgment about uncertainty: Bayesian decision making in realistic settings
4. Bjornsson, H. C. (1977) Risk Analysis of Construction Cost Estimates, Transactions, American Association of Cost Engineers, 182–9.