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Kiessling, Fabian; Heilmann, Melanie; Lammers, Twan; Ulbrich, Karel; Subr, Vladimir; Peschke, Peter; Waengler, Bjoern; Mier, Walter; Schrenk, Hans-Herrmann; Bock, Michael; Schad, Lothar; Semmler, Wolfhard . (2006). Synthesis and Characterization of HE-24.8:  A Polymeric Contrast Agent for Magnetic Resonance Angiography. Bioconjugate Chemistry, 17(1), 42–51. doi:10.1021/bc0501909 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research