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2. Fundamentals of designing of power plant (in Polish);Andrzejewski,1974
3. Directive 2004/8/EC of the European Parliament and of the Council of 11 February 2004 on the promotion of cogeneration based on a useful heat demand in the internal energy market and amending Directive 92/42/EC.
4. Specificity of municipal heat market (in Polish);Szczechowiak,2005
5. Energy efficiency in new houses. Heat demand reduction versus cogeneration;Gilijamse;Energy and Buildings,1995