1. FP6-2006-37065, Coordination Action for innovation in Life Cycle Analysis for Sustainability (CALCAS)
2. FP5- EVG3-CT-2002-80010, Tools for sustainability: development and application of an integrated framework (2003-2004)-SUSTOOLS
3. Global Reporting Initiative, available at: https://www.globalreporting.org/resourcelibrary/MMSS-Complete.pdf
4. Arcelor Mittals GRI-Reporting-Index, available at: http://corporate.arcelormittal.com/~/media/Files/A/ArcelorMittal/corporate-responsibility/ArcelorMittal-UNGC-and-GRI-index-2012.pdf
5. ThyssenKrupp, GRI-Index der Nachhaltigkeitsberichterstattung von ThyssenKrupp, http://www.thyssenkrupp.com/de/nachhaltigkeit/berichterstattung.html#