1. C. Dellacorte, et al., STLE PRESENTATION, No. 00-TC-4.
2. T. B. Barnum, H. G. Elrod, JR. Transactions of the ASME, 1971, pp.133–142
3. Silver, A. and Friedericy, J. A., 1975, United States Patent, No. 3,893,733.
4. H. Heshment, 1999, United States Patent, No. 5,988,885.
5. Kitazawa, S., Kaneko, S., and Watanabe, T., Proc. of IGTC Tokyo 2003.