Dave Heffler; RALPH-A dynamic instrument for sediment dynamics, Proceedings of MTS/IEEE OCEANS'96 Conference, pp. 728 - 732, September 1996.
Dave Heffler; Piston Corer Dynamics, Proceedings of IEEE OCEANS'91 Conference, pp. 1587 - 1591, October 1991.
D. E. Heffler; A timing correction for real time seismic signal processing, OCEANS'74 --- IEEE International Conference on Engineering in the Ocean Environment, pp. 212 - 217, August 1974.