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Dario, Paolo; Sandini, Giulio; Aebischer, Patrick . (1993). Robots and Biological Systems: Towards a New Bionics? || Swarm Intelligence in Cellular Robotic Systems. , 10.1007/978-3-642-58069-7(Chapter 38), 703–712. doi:10.1007/978-3-642-58069-7_38 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research