@article{Holt-2009-59075,
  author = {Holt, M and Noren, D and Veirs, V and Emmons, C and Veirs, S},
  title = {Speaking up: Killer whales (Orcinus orca) increase their call amplitude in response to vessel noise},
  journal = {The Journal of the Acoustical Society of America},
  year = {2009},
  month = {jan},
  publisher = {Acoustical Society of America},
  volume = {125},
  pages = {27--32},
  doi = {10.1121/1.3040028},
  url = {https://asa.scitation.org/doi/full/10.1121/1.3040028},
  keywords = {Noise, Marine Mammals, Cetaceans, Human Dimensions, Navigation},
}