@misc{indiciae24626c1718f1,
  title = {EX-5: Time Dependent Gravity Field Mapping},
  author = {Watkins, M. and Tapley, B. and Folkner, W. and Chao, B.},
  year = {2000},
  url = {https://ntrs.nasa.gov/citations/20060033106},
  note = {Source identifier: 20060033106}
}