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Helfenstein, Fabrice; Szép, Tibor; Nagy, Zsolt; Kempenaers, Bart; Wagner, Richard H. (2008). Between-male variation in sperm size, velocity and longevity in sand martins Riparia riparia. Journal of avian biology, 39(6), pp. 647-652. Copenhagen: Munksgaard 10.1111/j.1600-048X.2008.04450.x
