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2. sisHyd, product data sheet, Bentley web site (visited 01.04.2011): http://ftp2.bentley.com/dist/collateral/docs/bentley_sishyd/bentley-sisHYD_product-data-sheet.pdf
3. Grades heating, calculation system for district heating distribution networks, processvision web site (visited 01.04.2011): http://www.processvision.fi/
4. Methods for Planning and Operating Decentralized Combined Heat and Power Plants;Palsson,2000
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