@misc{indiciae6115e71cc977,
  title = {Method and apparatus for disabling an echo canceller on a digital telecommunications network},
  author = {Schroeder, George L. and Couch, Francis O. and Saenguraiporn, Chamna},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/20080008265},
  note = {Source identifier: 20080008265}
}