@misc{indiciaed4a64f19570f,
  title = {Exploring the limits of phase referenced VLBI imaging - A progress report},
  author = {Vermeulen, R. C. and Conway, J. E.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19920073816},
  note = {Source identifier: 19920073816}
}