@misc{indiciae6ef170945f2e,
  title = {Geopotential Field Anomaly Continuation with Multi-Altitude Observations},
  author = {Kim, Jeong Woo and Kim, Hyung Rae and von Frese, Ralph and Taylor, Patrick and Rangelova, Elena},
  year = {2012},
  url = {https://ntrs.nasa.gov/citations/20120010508},
  note = {Source identifier: 20120010508}
}