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Civantos, Ana; Giner, Mercè; Trueba, Paloma; Lascano, Sheila; Montoya-García, María-José; Arévalo, Cristina; Vázquez, María Ángeles; Allain, Jean Paul; Torres, Yadir . (2020). In Vitro Bone Cell Behavior on Porous Titanium Samples: Influence of Porosity by Loose Sintering and Space Holder Techniques. Metals, 10(5), 696–. doi:10.3390/met10050696 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research