@misc{indiciae013fec55736b,
  title = {Giotto interplanetary orbit determination},
  author = {Morley, Trevor A. and Hechler, Friedhelm and Jappe, Steen and Mottinger, Neil and Premkumar, R.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19870015942},
  note = {Source identifier: 19870015942}
}