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2. An analysis of the variability associated with the Vigneron-Dahl modification of the otter trawl by day and by night and a discussion of its action;Bagenal;J. Cons. Perm. Int. Explor. Mer,1958
3. Factors affecting variability of research vessel trawl surveys;Byrne;Can. Spec. Pub. Fish. Aquat. Sci.,1981
4. Catch variability due to variations in groundfish otter trawl behaviour and possibilities to reduce it through instrumented gear studies and improved fishing procedures;Carrothers;Can. Spec. Pub. Fish. Aquat. Sci.,1981