@misc{indiciaeff0a615f28b7,
  title = {Nonlinear interaction between two electrostatic harmonics in a plasma},
  author = {Verheest, F. and Lewak, G. J.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19760043165},
  note = {Source identifier: 19760043165}
}