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P.A. Rodnyi; S.B. Mikhrin; P. Dorenbos; E. van der Kolk; C.W.E. van Eijk; A.P. Vink; A.G. Avanesov. (2002). The observation of photon cascade emission in Pr3+-doped compounds under X-ray excitation. , 204(1-6), 237–245. doi:10.1016/s0030-4018(02)01243-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research