@misc{indiciae102340bc1b4c,
  title = {Vector magnetic field changes associated with X-class flares},
  author = {Wang, Haimin and Ewell, M. W., Jr. and Zirin, H. and Ai, Guoxiang},
  year = {1994},
  url = {https://ntrs.nasa.gov/citations/19950034551},
  note = {Source identifier: 19950034551}
}