@misc{indiciae3239fc1b3f35,
  title = {Studies of Solar Helicity Using Vector Magnetograms},
  author = {Hagyard, Mona J. and Pevstov, Alexei A.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/19990064143},
  note = {Source identifier: 19990064143}
}