Müssner, Rainer; Stephanie Schlegel; Floor Brouwer et al. 2005: Deliverable 4 – CROSS-COMPLIANCE Facilitating the CAP reform: Compliance and competitiveness of European agriculture – Specific Targeted Research or Innovation Project (STREP) – Integrating and Strengthening the European Research Area. Ecologic – Institute for International and European Environmental Policy/Wageningen University & Research Centre, Agricultural Economics Institute, Berlin.

Müssner, Rainer; Anna Leipprand; Stephanie Schlegel et al. 2006: Deliverable 5 – CROSS-COMPLIANCE Facilitating the CAP reform: Compliance and competitiveness of European agriculture – Mandatory standards in 7 EU countries and 3 non-EU countries – Germany Country Report. Ecologic – Institute for International and European Environmental Policy, Berlin.

Müssner, Rainer; Anna Leipprand; Stephanie Schlegel et al. 2006: Deliverable 6 – CROSS-COMPLIANCE Facilitating the CAP reform: Compliance and competitiveness of European agriculture – Specific Targeted Research or Innovation Project (STREP) – Integrating and Strengthening the European Research Area - Overview of certification schemes in 7 EU countries and 3 non-EU countries – Germany Country Report. Ecologic – Institute for International and European Environmental Policy, Berlin.