David Smith; Naval ocean systems center (Kailua, Hawaii), Proceedings of the First International Symposium on Unmanned Untethered Submersible Technology, vol. 1, p. 21, May 1980.
A. T. Nakagawa, D. C. Smith; A Report on Two Fiber-Optic-Tethered Underwater Vehicles, Proceedings of MTS/IEEE OCEANS'80 Conference, pp. 448 - 452, September 1980.