R. Spencer

J. Ashley, R. Spencer, J. Vassie; An inverted echo sounder for monitoring layer thickness in stratified oceans, Proceedings of IEEE OCEANS'98 Conference, pp. 248 - 252, September 1998.

P. R. Foden, R. Spencer, J. M. Vassie; An instrument for accurate sea level and wave measurement, Proceedings of IEEE OCEANS'98 Conference, pp. 405 - 408, September 1998.