@misc{indiciaef6fea9be52fa,
  title = {Interpretation of geomagnetic Pc3, 4 pulsations},
  author = {Bryunelli, B. E. and Lyatskaya, A. M. and Lyatskiy, V. B.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680023967},
  note = {Source identifier: 19680023967}
}