@misc{indiciaee3852587399d,
  title = {Radio optical reference frame. 6: Additional source positions in the northern hemisphere},
  author = {Fey, A. L. and Russell, J. L. and De Vegt, C. and Zacharias, N. and Johnston, K. J. and Ma, C. and Hall, D. M. and Holdenried, E. R.},
  year = {1994},
  url = {https://ntrs.nasa.gov/citations/19950033141},
  note = {Source identifier: 19950033141}
}