WASET
    Kemal Çomakli and  Uğur Çakir and  Ayşegül Çokgez Kuş and  Erol Şahin,  Contribution of the Cogeneration Systems to Environment and Sustainability.   journal   = {International Journal of Humanities and Social Sciences}, [online]. World Academy of Science, Engineering and Technology.
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    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/10002155.