Rosales-Asensio, Enrique, and David Borge-Diez. “District Heating and Cogeneration in the EU-28: Current Situation, Potential and Proposed Energy Strategy for Its Generalisation”. Multidisciplinary Journal for Education, Social and Technological Sciences, vol. 3, no. 2, Oct. 2016, pp. 107-55, doi:10.4995/muse.2016.6339.