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Cosín, Darío J. Díaz, Marta Novo, and Rosa Fernández. “Reproduction of Earthworms: Sexual Selection and Parthenogenesis.” In Biology of Earthworms, edited by Ayten Karaca, 24:69-86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://www.springerlink.com/content/j5j72p2834355w27/Arquivado 13 de setembro de 2019 en Wayback Machine..