R. Kollmann, S. Maier, K. Shahzad, F. Kretschmer, G. Neugebauer, G. Stoeglehner, T. Ertl, M. Narodoslawsky, Waste Water Treatment Plants as Regional Energy Cells – Evaluation of Economic and Ecologic Potentials in Austria, Chemical Engineering Transactions. 39 (2014) 607-612. doi:10.3303/CET1439102.