@article{1585309,
  author = {et EHT Collaboration al.},
  title = {First M87 Event Horizon Telescope Results. VII. Polarization of the Ring},
  year = {2021},
  journal = {ApJL},
  volume = {910},
  pages = {48},
  url = {https://iopscience.iop.org/article/10.3847/2041-8213/abe71d},
  language = {eng},
}