@article{eberhardt1962sound, title = {Sound Activity of the California Gray Whale, Eschrichtius Glaucus}, author = {Eberhardt, Robert L. and Evans, William}, journal = {J. Audio Eng. Soc}, volume = {10}, number = {4}, pages = {324--328}, year = {1962}, url = {https://www.aes.org/e-lib/browse.cfm?elib=833} }