Schoer, Karl; Weinzettel, Jan; Kovanda, Jan; Giegrich, Jürgen; Lauwigi, Christoph (3 August 2012). "Raw Material Consumption of the European Union – Concept, Calculation Method, and Results". Environmental Science & Technology. 46 (16): 8903–8909. Bibcode:2012EnST...46.8903S. doi:10.1021/es300434c. PMID22823351.
Schoer, Karl; Weinzettel, Jan; Kovanda, Jan; Giegrich, Jürgen; Lauwigi, Christoph (3 August 2012). "Raw Material Consumption of the European Union – Concept, Calculation Method, and Results". Environmental Science & Technology. 46 (16): 8903–8909. Bibcode:2012EnST...46.8903S. doi:10.1021/es300434c. PMID22823351.
Schoer, Karl; Weinzettel, Jan; Kovanda, Jan; Giegrich, Jürgen; Lauwigi, Christoph (3 August 2012). "Raw Material Consumption of the European Union – Concept, Calculation Method, and Results". Environmental Science & Technology. 46 (16): 8903–8909. Bibcode:2012EnST...46.8903S. doi:10.1021/es300434c. PMID22823351.