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Chen, Wei; Khamis, Heba; Birznieks, Ingvars; Lepora, Nathan F.; Redmond, Stephen J. . (2018). Tactile Sensors for Friction Estimation and Incipient Slip Detection – Towards Dexterous Robotic Manipulation: A Review. IEEE Sensors Journal, (), 1–1. doi:10.1109/jsen.2018.2868340 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research