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Bewszko, Tadeusz; Słyś, Daniel . (2014). Multi-criteria decision aid for the selection of open trenching technology for modernisation of municipal infrastructure systems. Tunnelling and Underground Space Technology, 39(), 94–101. doi:10.1016/j.tust.2012.11.012 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research