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- Tepelná Äerpadla / Karel SrdeÄný, FrantiÅ¡ek Macholda. . Brno : ERA group, 2005 . 111 s . ISBN 80-7366-031-8 : [1, currently available 1, Access to Shelves 1]
- Solárnà energie / Karel Murtinger, František Macholda. . Brno : ERA group, 2005 . 91 s . ISBN 80-7366-029-6 : [1, currently available 1, Access to Shelves 1]
- Ãspory energie v domÄ / Karel SrdeÄný, FrantiÅ¡ek Macholda. . Praha : Grada Publishing, 2004 . 111 s . ISBN 80-247-0523-0 : [1, currently available 1, Access to Shelves 1]