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Yeck, William L.; Sheehan, Anne F.; Stachnik, Joshua C.; Lin, Fan-Chi . (2017). Offshore Rayleigh group velocity observations of the South Island, New Zealand, from ambient noise data. Geophysical Journal International, 209(2), 827–841. doi:10.1093/gji/ggx054 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research