@misc{indiciaea3a1ea44478b,
  title = {Imprint of oaks on nitrogen availability and δ 15 N in California grassland-savanna: A case of enhanced N inputs?},
  author = {S.S. Perakis and C.H. Kellogg},
  year = {2006},
  doi = {10.1007/s11258-006-9238-9},
  url = {https://pubs.usgs.gov/publication/70030901},
  note = {Source identifier: 70030901}
}