J. N. Havenhand, C. D. Todd, Reproductive Effort of the Nudibranch Molluscs Adalaria proxima (Alder & Hancock) and Onchidoris muricata (Muller): An Evaluation of Techniques, Functional Ecology, Vol. 3, No. 2 (1989), pp. 153-163
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Havenhand et al. (1989) studied this question.
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