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Trappmann, Britta; Gautrot, Julien E.; Connelly, John T.; Strange, Daniel G. T.; Li, Yuan; Oyen, Michelle L.; Cohen Stuart, Martien A.; Boehm, Heike; Li, Bojun; Vogel, Viola; Spatz, Joachim P.; Watt, Fiona M.; Huck, Wilhelm T. S. . (2012). Extracellular-matrix tethering regulates stem-cell fate. Nature Materials, 11(7), 642–649. doi:10.1038/NMAT3339 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research