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Yves Piquot, Daniel Petit, Myriam Valero, , Patrick de Laguerie, Philippe Vernet, Variation in Sexual and Asexual Reproduction among Young and Old Populations of the Perennial Macrophyte Sparganium erectum, Oikos, Vol. 82, No. 1 (May, 1998), pp. 139-148
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Piquot et al. (1998) studied this question.
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