@misc{indiciae0f26125715bc,
  title = {Gradiometry coexperiments to the gravity probe B and step missions},
  author = {Tapley, M. and Breakwell, J. and Everitt, C. W. F. and Vanpatten, R. and Worden, P.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910004475},
  note = {Source identifier: 19910004475}
}