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Yoshihiko Hangai; Takao Utsunomiya. (2009). Fabrication of Porous Aluminum Using Gases Intrinsically Contained in Aluminum Alloy Die Castings. , 40(6), 1284–1287. doi:10.1007/s11661-009-9835-z 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research