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Strąkowska, Paulina; Beutner, René; Gnyba, Marcin; Zielinski, Andrzej; Scharnweber, Dieter . (2016). Electrochemically assisted deposition of hydroxyapatite on Ti6Al4V substrates covered by CVD diamond films — Coating characterization and first cell biological results. Materials Science and Engineering: C, 59(), 624–635. doi:10.1016/j.msec.2015.10.063 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research