TASR ENERGIA: Cogeneration units increase energy efficiency
http://195.46.72.16/free/jsp/search/view/ViewerPure

Energia.sk: Cogeneration units increase energy efficiency
http://www.energia.sk

Openiazoch.sk: Cogeneration units increase energy efficiency
http://openiazoch.zoznam.sk

Energie-portal.sk: Cogeneration units in Slovakia increase in number. Bratislava unit in operation since October.
http://energie-portal.sk