@article{Langbauer1991elephants,
  author = {Langbauer and Payne and Charif and others},
  title = {African Elephants Respond to Distant Playbacks of Low-Frequency Conspecific Calls},
  journal = {Journal of Experimental Biology},
  year = {1991},
  doi = {10.1242/jeb.157.1.35},
  url = {https://doi.org/10.1242/jeb.157.1.35}
}