Age-group estimation in free-ranging African elephants based on acoustic cues of low-frequency rumbles

A. Stöger, M. Zeppelzauer, A. Baotic:
"Age-group estimation in free-ranging African elephants based on acoustic cues of low-frequency rumbles";
Bioacoustics-The International Journal Of Animal Sound And Its Recording,23(2014), 3; S. 231 - 246.