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Visser, L. C.; Stramigioli, S.; Carloni, R. . (2012). [IEEE 2012 4th IEEE RAS & EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob 2012) - Rome, Italy (2012.06.24-2012.06.27)] 2012 4th IEEE RAS & EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob) - Robust bipedal walking with variable leg stiffness. , (), 1626–1631. doi:10.1109/biorob.2012.6290284 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research