1. Bias in hydroacoustic estimates of fish abundance due to acoustic shadowing: evidence from day–night surveys of vertically migrating fish;Appenzeller;Can. J. Fish. Aquatic Sci.,1992
2. Hydroacoustic assessment of the abundance and distribution of rainbow smelt in Lake Oahe;Burczynski;N. Am. J. Fish. Manage.,1987
3. Duncan, A., Kubecka, J., 1993. Hydroacoustic Methods of Fish Surveys. National Rivers Authority R&D Note 196, pp. 136.
4. Duncan, A., Kubecka, J., 1995. Acoustic size vs. real size relationships for common species of fish. National Rivers Authority R&D Note 374, pp. 84.
5. Maintaining precision calibrations with optimal copper spheres;Foote;J. Acoust. Soc. Am.,1983