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2. Trend Impact Analysis, “Futures Research Methodology V2”;Gordon,2003
3. L. Firminger, Trend Analysis: Methods and Problems, Strategic Planning Services, Swinburne University of Technology, TAFE Division, March, (2003).
4. The Delphi method, “Futures Research Methodology V2”;Gordon,2003
5. RT Delphi: an efficient, “round-less” almost real time Delphi method;Gordon;Technol. Forecast. Soc. Change,2006