The Fertile xy Females of Akodon (rodentia, sigmodontinae). The Case of A. Azarae and A. Boliviensis - Lisanti, JA; Sánchez, A; Pinna-Senn, E; Ortiz, MI; Dalmasso, G; Bella Sombría, José Luis (978-1-60741-304-2, 2009)