1. Antonevich, J. 1976. Welding J. July 1976. pp.200s–207s.
2. Ashkin, A., G. D. Boyd, and J. M. Dziedzic. 1966. IEEE J Quant. Elec. QE. 2:109.
3. Assembly Automation. 1988. pp. 195–96.
4. Bayba, A. J. 1989–1990. Harry Diamond Laboratories Report. Nos. 1–17.
5. Bredzs, N., and C. C. Tennenhouse. 1970. Welding J.: Welding Research Supplement, pp. 86–90.