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Nishida, Masahiro; Kuzuya, Kayoko; Hayashi, Koichi; Hasegawa, Sunao . (2013). Effects of alloy type and heat treatment on ejecta and crater sizes in aluminum alloys subjected to hypervelocity impacts. International Journal of Impact Engineering, 54(), 161–176. doi:10.1016/j.ijimpeng.2012.11.004 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research