Alan Wirtz, William Acker; A Microprocessor Based Echo Integration System for Fisheries Research, Proceedings of MTS/IEEE OCEANS'80 Conference, pp. 392 - 397, September 1980.

Alan R. Wirtz, William C. Acker; A Versatile Sonar System for Fisheries Research and Management Applications, Proceedings of MTS/IEEE OCEANS'79 Conference, pp. 64 - 68, September 1979.

J. E. Ehrenberg, J. H. Green, A. R. Wirtz; A Dual-Beam Acoustic System for Measuring the Target Strength of Individual Fish, Proceedings of MTS/IEEE OCEANS'76 Conference, pp. 434 - 438, September 1976.