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Zoran Mazej; Evgeny Goreshnik; Kohei Hironaka; Yasushi Katayama; Rika Hagiwara. (2009). Synthesis and Characterization of LnF(HF)(BF4)2 (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, and Dy), and Crystal Structures of LnF(HF)(BF4)2 (Ln = Pr, Nd) and La(BF4)3. , 635(13-14), 2309–2315. doi:10.1002/zaac.200900123 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research