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Dan Zhao; Hao Zhang; Shu-Ping Huang; Wei-Long Zhang; Song-Lin Yang; Wen-Dan Cheng. (2009). Crystal and band structure of K2AlTi(PO4)3 with the langbeinite-type structure. , 477(1-2), 0–799. doi:10.1016/j.jallcom.2008.10.124 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research