@misc{indiciae821a1a3c7bda,
  title = {Starspots - The zebra effect},
  author = {Pettersen, Bjorn R. and Hawley, Suzanne L. and Fisher, George H.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930033822},
  note = {Source identifier: 19930033822}
}