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Denys J. Loeffelbein; Michael Souvatzoglou; Veronika Wankerl; Axel Martinez-Möller; Julia Dinges; Markus Schwaiger; Ambros J. Beer. (2012). PET-MRI Fusion in Head-and-Neck Oncology: Current Status and Implications for Hybrid PET/MRI. , 70(2), 473–483. doi:10.1016/j.joms.2011.02.120 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research