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Nord, A.; Yates, S.; Beck, O.; Belic, D.; von Brentano, P.; Eckert, T.; Fransen, C.; Herzberg, R.-D.; Kneissl, U.; Maser, H.; Pietralla, N.; Pitz, H.; Werner, V. . (1998). Low-lying dipole strength in 207Pb. Physical Review C, 57(6), 3459–3461. doi:10.1103/PhysRevC.57.3459 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research