@misc{indiciae1652db2ab169,
  title = {Difference equation technique for determining the evolution of radially symmetric ultrasonic fields},
  author = {Dockery, G. D. and Claus, R. O.},
  year = {1983},
  url = {https://ntrs.nasa.gov/citations/19850045967},
  note = {Source identifier: 19850045967}
}