Stelling, Allison L., Toher, Deirdre, Uckermann, Ortrud, Tavkin, Jelena, Leipnitz, Elke, Schweizer, Julia, Cramm, Holger, Steiner, Gerald, Geiger, Kathrin D., Kirsch, Matthias, "Infrared Spectroscopic Studies of Cells and Tissues: Triple Helix Proteins as a Potential Biomarker for Tumors", PLoS ONE, 2013