@misc{indiciae595c6e5725d5,
  title = {The structure of helical interplanetary magnetic fields},
  author = {Goldstein, M. L. and Roberts, D. A. and Fitch, C. A.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910063738},
  note = {Source identifier: 19910063738}
}