By Ji Q.   Le L.H.   Filipow L.J.   Jackson S.A.   in Ultrasonics

ISSN:0041-624X|36|6|759-765

Elsevier‎(1998)‎

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By Ta D   Wang W   Wang Y   Le L H   in Insight - Non-Destructive Testing and Condition Monitoring

ISSN:1354-2575|50|1|14-18

The British Institute of Non-Destructive Testing‎(2008)‎

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