1. Anon 1990. SIMRAD EK500 Scientific echo sounder. Instruction manual. P2172E, 1990–1997. Contents: Operators manual, P2170E Installation Manual P2180E, Service Manual 2161E.
2. On the statistical analysis of dirty pictures;Besag;J. R. Stat. Soc. Ser. B Stat. Methodol.,1986
3. Development and application of an empirical multifrequency method for backscatter classification;De Robertis;Can. J. Fish. Aquat. Sci.,2010
4. Calibration of acoustic instruments. ICES Cooperative Research Report No. 326;Demer,2015
5. Reconciling theoretical versus empirical target strengths of krill: effects of phase variability on the distorted-wave Born approximation;Demer;ICES J. Mar. Sci.,2003