J. Pellegrino, Maria da Glória R. Goncalves, A Simple Method for Collecting Egg Clutches of Biomphalaria glabrata (Australorbis glabratus) and for Rearing Newly Hatched Snails, The Journal of Parasitology, Vol. 51, No. 6 (Dec., 1965), p. 1014
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Pellegrino et al. (1965) studied this question.
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