Andreas Graefe and J. Scott Armstrong Comparing face-to-face meetings, nominal groups, Delphi and prediction markets on an estimation task articleComparing face-to-face meetings, nominal groups, Delphi and prediction markets on an estimation taskAndreas Graefe and J. Scott ArmstrongInternational Journal of Forecasting, vol. 27, no. 1, 2011, pp. 183–195PDF
