@misc{indiciae36b3ca89d813,
  title = {Venus gravity fields},
  author = {Sjogren, W. L. and Ananda, M. and Williams, B. G. and Birkeland, P. W. and Esposito, P. S. and Wimberly, R. N. and Ritke, S. J.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810053843},
  note = {Source identifier: 19810053843}
}