Acoustics Research Letters Online July 2003 Volume 4, Issue 3 Analysis and effectiveness of deer whistles for motor vehicles: frequencies, levels, and animal threshold responses Peter M. Scheifele, David G. Browning, and Lesa M. Collins-Scheifele pp. 71-76
Songlike vocalizations from the Sumatran Rhinoceros (Dicerorhinus sumatrensis) Elizabeth von Muggenthaler, Paul Reinhart, Brad Lympany, and R. Barton Craft pp. 83-88
