| Original language | English |
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| Place of Publication | Roskilde |
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| Publisher | Risø National Laboratory, UNEP Risø Centre |
| Number of pages | 25 |
| ISBN (Print) | 87-550-2103-4 |
| Publication status | Published - 1995 |
| Series | UNEP Collaborating Centre on Energy and Environment. Working Paper |
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| Number | 3 |