1
Published: 1977
Superior document: Research memorandum / International Institute for Applied Systems Analysis 77,55
2
3
Published: 2015.
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4
Published: 1996.
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5
Published: 1997.
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6
Published: 1990.
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7
Published: 1995.
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8
Published: 1997.
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9
Published: 1999.
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