@misc{indiciaeae237d34feed,
  title = {Optical sample-position sensing for electrostatic levitation},
  author = {Sridharan, G. and Chung, S. and Elleman, D. and Whim, W. K.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19900058142},
  note = {Source identifier: 19900058142}
}