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E van der Kolk; P Dorenbos; C.W.E van Eijk. (2001). Vacuum ultraviolet excitation and quantum splitting of Pr3+ in LaZrF7 and α-LaZr3F15. , 197(4-6), 317–326. doi:10.1016/s0030-4018(01)01452-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research