Cita recomanada
Briz González, Maria Dolors ; Bonet, Sergi ; Fradera, Anna. (1991). The sperm and quality and fertility of boars after two different ejaculation frequences. Girona: Universitat. [Consulta: 25 Maig 2013]. Disponible a: http://raco.cat/index.php/Scientia/article/view/45463/0http://hdl.handle.net/10256/5315