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G. Bozzini; P. Colin; N. Betrouni; P. Nevoux; A. Ouzzane; P. Puech; A. Villers; S. Mordon. (2012). Photodynamic therapy in urology: What can we do now and where are we heading?. , 9(3), –. doi:10.1016/j.pdpdt.2012.01.005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research