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Brendan J. Kennedy; Paul J. Saines; Yoshiki Kubota; Chiharu Minakata; Hiroko Hano; Kenichi Kato; Masaki Takata. (2007). Crystal structures and phase transitions in Ba2HoTaO6. , 42(11), 1875–1880. doi:10.1016/j.materresbull.2007.07.027 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research