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Helfenstein, Fabrice; Podevin, Murielle; Richner, Heinz (2010). Sperm morphology, swimming velocity, and longevity in the house sparrow Passer domesticus. Behavioral ecology and sociobiology, 64(4), pp. 557-565. Heidelberg: Springer-Verlag 10.1007/s00265-009-0871-x
