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The Delphi method : techniques and applications
Linstone, Harold A. (ed.); Turoff, Murray (contributor);  … - 1975
Persistent link: https://www.econbiz.de/10000050439
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Report on a long-range forecasting study : [Tab.] ; [enth. Appendix]
Gordon, Theodore J.; Helmer, Olaf - 1964
Persistent link: https://www.econbiz.de/10000317688
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An agenda for futures research
Helmer, Olaf - In: Futures : the journal of policy, planning and futures … 7 (1975) 1, pp. 3-14
Persistent link: https://www.econbiz.de/10002762757
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Politische Analyse der Zukunft
Helmer, Olaf - In: Futurum : Zeitschrift für Zukunftsforschung 4 (1971) 2, pp. 135-143
Persistent link: https://www.econbiz.de/10002762795
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Problems in futures research : Delphi and casual cross-impact analysis
Helmer, Olaf - In: Futures : the journal of policy, planning and futures … 9 (1977) 1, pp. 17-31
Persistent link: https://www.econbiz.de/10002762800
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Looking forward : a guide to futures research
Helmer, Olaf - 1983
Persistent link: https://www.econbiz.de/10001663968
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Looking forward : a guide to futures research
Helmer, Olaf - 1983
Persistent link: https://www.econbiz.de/10004057758