Chapters by MSc. Karl-Heinz Kettl

• Book Chapter Economic and Ecological Potential Assessment for Biogas Production Based on Intercrops
  by Nora Niemetz, Karl-Heinz Kettl, Manfred Szerencsits and Michael Narodoslawsky in the book "Biogas" edited by Sunil Kumar, ISBN 978-953-51-0204-5, InTech, March 3, 2012