@misc{indiciae60b0b648aea6,
  title = {Beat frequency ultrasonic microsphere contrast agent detection system},
  author = {Pretlow, III, Robert A. and Yost, William T. and Cantrell, Jr., John H.},
  year = {1997},
  url = {https://ntrs.nasa.gov/citations/20080004837},
  note = {Source identifier: 20080004837}
}