Correlated Orientation Sounds and Ear Movements of Horseshoe Bats - GRIFFIN, D. R.; DUNNING, D. C.; CAHLANDER, D. A.; WEBSTER, F. A. (Nature Publishing Group, 1962)
http://dx.doi.org/10.1038/1961185a0
Keywords: W; V; WW-YZ; TA-TD; U