Determinants of variability in signature whistles of the Mediterranean common bottlenose dolphin oleh Gabriella La Manna, Nikolina Rako-Gospić, Daniela Silvia Pace, Silvia Bonizzoni, Lucia Di Iorio, Lauren Polimeno, Francesco Perretti, Fabio Ronchetti, Giancarlo Giacomini, Gianni Pavan, Giulia Pedrazzi, Helena Labach, Giulia Ceccherelli