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- [7] A New Type of Energy Efficient Central Heating System 6TH INTERNATIONAL SYMPOSIUM ON HEATING, VENTILATING AND AIR CONDITIONING, VOLS I-III, PROCEEDINGS, 2009, : 1616 - 1623
- [8] A solar water-heating system with an additional energy source Geliotekhnika, 1992, (04): : 43 - 47