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Yumi Yasuoka; Yusuke Kawada; Hiroyuki Nagahama; Yasutaka Omori; Tetsuo Ishikawa; Shinji Tokonami; Masaki Shinogi. (2009). Preseismic changes in atmospheric radon concentration and crustal strain. , 34(6-7), 0–434. doi:10.1016/j.pce.2008.06.005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research