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Levine, R. A.; Forest, T.; Smith, C. . (2002). Tumor Suppressor PTEN is Mutated in Canine Osteosarcoma Cell Lines and Tumors. Veterinary Pathology, 39(3), 372–378. doi:10.1354/vp.39-3-372 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research