K. Fink, A. Koch, P. Laborgne, and S. Wassermann. Energy efficiency first: the foundation of a low-carbon society : ECEEE 2011 summer study ; conference proceedings, page 1861-1866. Stockholm, European Council for an Energy Efficient Economy, (2011)
D. Zech, T. Jenssen, L. Eltrop, and S. Wassermann. 19. Symposium Bioenergie : Festbrennstoffe, Biokraftstoffe, Biogas ; 25./26. November 2010, Kloster Banz, Bad Staffelstein, Regensburg, OTTI, (2010)