?url_ver=Z39.88-2004&rft_id=doi%3A10.1029%2F2011JB008447&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Wu%2C+Zhengxiao&rft.aulast=Wu&rft.aufirst=Zhengxiao&rft.issue=B12&rft.volume=116&rft.date=24+December+2011&rft.issn=0148-0227&rft.atitle=Quasi-hidden+Markov+model+and+its+applications+in+cluster+analysis+of+earthquake+catalogs&rft.title=Journal+of+Geophysical+Research&rft.genre=article