@misc{indiciae7d7bbe3263c8,
  title = {Potential nitrogen fixation activity of different aged biological soil crusts from rehabilitated grasslands of the hilly Loess Plateau, China},
  author = {Y. Zhao and M. Xu and J. Belnap},
  year = {2010},
  url = {https://pubs.usgs.gov/publication/70003350},
  note = {Source identifier: 70003350}
}