• [Wiki] http://en.wikipedia.org/wiki/Physa_fontinalis.
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• [Wit1955a] de Wit, W. (1955b). The life cycle and some other biological details of the fresh-water snail Physa fontinalis (L.). Basteria, 19(4):45--76.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.