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2. T. F. Jonas and R. F. Siegmund, in Proceedings of 5th SAMPE Technology Conference, Montreux, 1985 (Society Advancement of Material and Process Engineering). Paper 5.
3. W. J. Cantwell and J. Morton, Compos. Struct. 3 (1985) 241.
4. S. M. Bishop, ibid. 3 (1985) 295.
5. W. J. Murri, B. W. Sermon and L. H. Pearson, in Proceedings of 15th Symposium on Nondestructive Evaluation, San Antonio, April 1985 (American Society of Non-Destructive Testing/Southurst Research Institute).