@article{6163,
  author = {Robert Fesen and J. Shull and Alan Hurford},
  title = {An Optical Study of the Circumstellar Environment Around the Crab Nebula},
  year = {1997},
  journal = {The Astronomical Journal},
  volume = {113},
  pages = {354},
  month = {Jan-01-1997},
  issn = {00046256},
  url = {http://adsabs.harvard.edu/full/1997AJ....113..354F},
  doi = {10.1086/118258},
}