@misc{indiciae157dc5ef3533,
  title = {Method and apparatus for shaping and enhancing acoustical levitation forces},
  author = {Oran, W. A. and Berge, L. H. and Reiss, D. A. and Johnson, J. L.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19810007252},
  note = {Source identifier: 19810007252}
}