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[2]
SMITH RA, 1998, P NDT 98 BRIT I NDT, P87
[3]
SMITH RA, 1999, P 2 JOINT ASA FAA DO, P294
[4]
Willsher SJ, 1998, INSIGHT, V40, P154
[5]
WILLSHER SJ, 1998, P NDT 98 BRIT I NDT, P46