@misc{indiciae2b2555169b0c,
  title = {Directional differences in visual acuity during vertical nystagmus},
  author = {Hixson, W. C. and Niven, J. I.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690028894},
  note = {Source identifier: 19690028894}
}