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Vartiainen, Ismo; Warmer, Martin; Goeries, Dennis; Herker, Eva; Reimer, Rudolph; David, Christian; Meents, Alke . (2014). Towards tender X-rays with Zernike phase-contrast imaging of biological samples at 50 nm resolution. Journal of Synchrotron Radiation, 21(4), 790–794. doi:10.1107/S1600577514010388 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research