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Harris, JE 1963 The role of endogenous rhythms in vertical migration. Journal of the Marine Biological Association of the United Kingdom, 43 (1). 153-166.
Harris, JE 1952 A note on the breeding season, sex ratio and embryonic development of the dogfish Scyliorhinus canicula (L.). Journal of the Marine Biological Association of the United Kingdom, 31 (2). 269-276.