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Struis, Rudolf P.W.; Ludwig, Christian; Barrelet, Timothée; Krähenbühl, Urs; Rennenberg, Heinz (2008). Studying sulphur functional groups in Norway spruce year rings using S L-edge total electron yield spectroscopy. Science of the total environment, 403(1-3), pp. 196-206. Amsterdam: Elsevier 10.1016/j.scitotenv.2008.05.034
Gudas, Karolis (2017). Cross-Border Electricity Infrastructures and Efficient Use of Resources. In: Ludwig, Christian; Matasci, Cecilia (eds.) Boosting Resource Productivity by Adopting the Circular Economy (pp. 60-64). Villigen, Switzerland: World Resources Forum and Paul Scherrer Institute
