@misc{indiciaef53fbccebe4f,
  title = {Nonlinear interactions and the 'Kemp echo'.},
  author = {E de Boer},
  year = {1980},
  doi = {10.1016/0378-5955(80)90089-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/7410257/},
  note = {Source identifier: 7410257}
}