@misc{indiciae6c623930f7ea,
  title = {Acoustical levitation for space processing},
  author = {Wang, T. G. and Saffren, M. M. and Elleman, D. D.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19740052881},
  note = {Source identifier: 19740052881}
}