James F. Bartram, Richard R. Ramseyer, J. Matt Heines; Fifth generation digital sonar signal processing, IEEE J. Oceanic Eng., vol. 2, pp. 337 - 343, October 1977.
Richard R. Ramseyer, Salvatore D. Morgera, Andries van Dam; Solving signal processing algorithms with a multi-microprocessor network, Proceedings of MTS/IEEE OCEANS'77 Conference, pp. 745 - 750, September 1977.