Structure and Possible Functions of Constant-Frequency Calls in Ariopsis seemanni (Osteichthyes, Ariidae) Schmidtke, Daniel ; Schulz, Jochen ; Hartung, Jörg ; Esser, Karl-Heinz Abstract Publication: PLoS ONE Pub Date: May 2013 DOI: 10.1371/journal.pone.0064864 Bibcode: 2013PLoSO...864864S