Robert H. Stewart; The NASA NSCAT and Topex/Poseidon programs, Proceedings of MTS/IEEE OCEANS'85 Conference, pp. 256 - 263, November 1985.
Calvin C. Teague, G. Leonard Tyler, Robert H. Stewart; Studies of the sea using HF radio scatter, IEEE J. Oceanic Eng., vol. 2, pp. 12 - 19, January 1977.
Robert H. Stewart, Joseph W. Joy; High frequency radio measurements of ocean currents, OCEANS'73 --- IEEE International Conference on Engineering in the Ocean Environment, pp. 64 - 67, September 1973.