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《Progress In Geophysics》 1992-03
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Li Youming(lnstitute of Geophysics, CAS, Beijing 100101)Yang Wencai(Beijing Computer Center of Geology, Beijing 100083)  
This paper points out some intrinsic drawbacks of classical inversion methods in geophysics, then discusses the developements-and progress on wave equation inversion, and seismic tomography as well as seismic mlgration, finally, gives some comments on the research trend of seismic inverse ptoblems.
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