@misc{indiciaef4ae991e7675,
  title = {Soil N and 15N variation with time in a California annual grassland ecosystem},
  author = {D.L. Brenner and Ronald Amundson and W. Troy Baisden and C. Kendall and J. Harden},
  year = {2001},
  doi = {10.1016/s0016-7037(01)00699-8},
  url = {https://pubs.usgs.gov/publication/70022807},
  note = {Source identifier: 70022807}
}