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.