R. Volden, J. G. Balchen;
Determining 3-D object coordinates from a sequence of 2-D images, Proceedings of the Eighth International Symposium on Unmanned Untethered Submersible Technology, vol. 8,
pp. 359 - 369, September 1993.
Thor I. Fossen, Jens G. Balchen;
The NEROV Autonomous Underwater Vehicle, Proceedings of IEEE OCEANS'91 Conference,
pp. 1414 - 1420, October 1991.