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Liptak, J.M.; Simpson, D.J. . (2000). Successful Management of Quadriceps Contracture in a Cat Using a Dynamic Flexion Apparatus. Veterinary and Comparative Orthopaedics and Traumatology, 13(1), 44–48. doi:10.1055/s-0038-1632629 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research