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Walte, F., Gebhardt, W., & Hoffmann, R. (1992).
NDT of vertical orientated cracks by mode conversion with optimized LLT probes. NDT & E International, 25(3), 153–154.
doi:10.1016/0963-8695(92)90438-m
10.1016/0963-8695(92)90438-m
