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Doellinger, Johannes; Spies, Markus; Burgard, Wolfram . (2018). Predicting Occupancy Distributions of Walking Humans With Convolutional Neural Networks. IEEE Robotics and Automation Letters, 3(3), 1522–1528. doi:10.1109/LRA.2018.2800780 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research