@misc{indiciaef2bef90cdeea,
  title = {Vitality and chemistry of roots of red spruce in forest floors of stands with a gradient of soil Al/Ca ratios in the northeastern United States},
  author = {P.M. Wargo and K. Vogt and D. Vogt and Q. Holifield and J. Tilley and G. Lawrence and M. David},
  year = {2003},
  doi = {10.1139/x02-195},
  url = {https://pubs.usgs.gov/publication/70025774},
  note = {Source identifier: 70025774}
}