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Sobierajski, Julia; Hendgen-Cotta, Ulrike B.; Luedike, Peter; Stock, Pia; Rammos, Christos; Meyer, Christian; Kraemer, Sandra; Stoppe, Christian; Bernhagen, Jürgen; Kelm, Malte; Rassaf, Tienush . (2013). Assessment of macrophage migration inhibitory factor in humans: protocol for accurate and reproducible levels. Free Radical Biology and Medicine, 63(), 236–242. doi:10.1016/j.freeradbiomed.2013.05.018 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research