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TANAKA, Kouetsu; TAKANO, Kentaro; KAJITANI, Makoto; KANAMORI, Chisato . (1999). Development of a Construction Robot for Marking on Ceiling Boards. 2nd Report. Drawing a Long Straight Line on the Ceiling.. Transactions of the Japan Society of Mechanical Engineers Series C, 65(634), 2398–2404. doi:10.1299/kikaic.65.2398 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research