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    <title>Overview on Techniques and Models Used in the Energy Field</title>
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    <abstract>The so-called &quot;energy crisis&quot; has caused increasing concern in the energy industry and in governments. The procedures of environmental protection have further complicated the energy supply and price picture. 

The question of how serious an energy problem we are facing and of alternative strategies can be studied by means of extensive models. The adequacy of the available models and the possibilities of the different kinds of models under development are being exhaustively reviewed in most countries. The use of models for decision making in industry is quite well developed, while their use by governments, at national or international levels, is in the beginning stages. 

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