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Helmer, O. & Blencke, L. (1979). GEM: An Interactive Simulation Model of the Global Economy. IIASA Research Report. IIASA, Laxenburg, Austria: RR-79-004

Helmer, O. (1978). Cross-Impact Gaming Applied to Global Resources. IIASA Research Memorandum. IIASA, Laxenburg, Austria: RM-78-004

Helmer, O. (1978). Voter Satisfaction Maximization in Problems of Resource Allocation. IIASA Working Paper. IIASA, Laxenburg, Austria: WP-78-025

Helmer, O. (1977). The Utility of Long-Term Forecasting. IIASA Professional Paper. IIASA, Laxenburg, Austria: PP-77-005

Helmer, O. (1977). A Cross-Impact Gaming Approach to Global Modeling. IIASA Working Paper. IIASA, Laxenburg, Austria: WP-77-001

Helmer, O. (1977). An Interactive Simulation Model of the Global Economy. IIASA Working Paper. IIASA, Laxenburg, Austria: WP-77-011

Helmer, O. (1977). Problems in futures research: Delphi and causal cross-impact analysis. Futures 9 (1), 17-31. 10.1016/0016-3287(77)90049-0.