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Zhao, Wenke; Forte, Emanuele; Levi, Sara Tiziana; Pipan, Michele; Tian, Gang . (2015). Improved high-resolution GPR imaging and characterization of prehistoric archaeological features by means of attribute analysis. Journal of Archaeological Science, 54(), 77–85. doi:10.1016/j.jas.2014.11.033 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research