Frondel, Manuel, Jens Horbach, Klaus Rennings and Till Requate (2005), Environmental Policy Tools and Firm-Level Management Practices: Empirical Evidence for Germany, RWI-Mitteilungen 54/55, Issue 2.

Frondel, Manuel and Christoph M. Schmidt (2003), Rejecting Capital-Skill Complementarity at All Costs, Economics Letters 80 (1), 15-21.

Frondel, Manuel (2003), Empirical Assessment of Energy-Price Policies: the Case for Cross-Price Elasticities, Energy Policy.

Frondel, Manuel and Christoph M. Schmidt (2002), The Capital-Energy Controversy: An Artifact of Cost Shares?, The Energy Journal Vol.23, Issue 3, 53-79.

Frondel, Manuel and Dirk Rübbelke (2002), Technological Efficiency Improvements: Beyond the Prospects of First-Law Efficiencies, International Journal of Environment and Pollution Vol. 18, No.3, 287-293.

Frondel, Manuel and Dirk Rübbelke (2002), The Domino Effect in Climate Change, International Journal of Environment and Pollution Volume 17, Issue 3, 202-210.

Frondel, Manuel (2003), Special Issue on: Energy Conservation, in: Manuel Frondel International Journal of Energy Policy and Technology,

Frondel, Manuel, Jens Horbach and Klaus Rennings (2004), End-of-Pipe or Cleaner Production? An Empirical Comparison of Environmental Innovation Decisions Across OECD Countries, ZEW Discussion Paper No. 04-82, Mannheim

Böhringer, Christoph and Manuel Frondel (2002), Assessing Voluntary Commitments: Monitoring is Not Enough!, ZEW Discussion Paper No. 02-62, Mannheim

Frondel, Manuel and Christoph M. Schmidt (2002), The Empirical Assessment of Technology Differences: Comparing the Comparable, ZEW Discussion Paper No. 02-63, Mannheim

Frondel, Manuel and Christoph M. Schmidt (2001), Rejecting Capital-Skill Complementarity at all Costs, ZEW Discussion Paper No. 01-27, Mannheim

Frondel, Manuel and Christoph M. Schmidt (2001), Evaluating Environmental Programs: The Perspective of Modern Evaluation Research, ZEW Discussion Paper No. 01-59, Mannheim

Frondel, Manuel and Christoph M. Schmidt (2000), Facing the Truth about Separability: Nothing Works Without Energy, Heidelberg University, Department of Economics, Discussion Paper Series , Heidelberg, www.uni-heidelberg.de/institute/fak18/publications/papers/dp331.pdf.

Frondel, Manuel and Christoph M. Schmidt (2000), The Capital-Energy Controversy: A Reconciliation, Heidelberg University, Department of Economics, Discussion Paper Series , Heidelberg, www.uni-heidelberg.de/institute/fak18/publications/papers/dp318.pdf.

Frondel, Manuel and Christoph M. Schmidt (2000), The Real Elasticity of Substitution - An Obituary, Heidelberg University, Department of Economics, Discussion Paper Series , Heidelberg, www.uni-heidelberg.de/institute/fak18/publications/papers/dp341.pdf.

Frondel, Manuel (1999), Interpreting Allen, Morishima and Technical Elasticities of Substitution: A Theoretical and Empirical Comparison., Heidelberg University, Department of Economics, Discussion Paper Series , Heidelberg.

Frondel, Manuel (1997), Thermodynamik und der Ökonomische Prozeß, Heidelberg University, Department of Economics, Discussion Paper Series , Heidelberg.

ZEW-Energiemarktbarometer September 2003

ZEW-Energiemarktbarometer Januar/Februar 2003