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W. Kurcewicz; E. Ruchowska; N. Kaffrell; N. Trautmann. (1977). Precise energies of gamma rays from the 230Th and 228Th decay. , 146(3), 613–614. doi:10.1016/0029-554x(77)90224-5 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research