@misc{indiciaea493951106d8,
  title = {Effect of chronic nitrogen additions on soil nitrogen fractions in red spruce stands},
  author = {M.B. David and A.M. Cupples and G.B. Lawrence and G. Shi and K. Vogt and P.M. Wargo},
  year = {1998},
  doi = {10.1023/a:1005012400047},
  url = {https://pubs.usgs.gov/publication/70020849},
  note = {Source identifier: 70020849}
}