@misc{indiciaed8b134dec45f,
  title = {Quantitative variation and the ecological role of vulpinic acid and atranorin in thallus of Letharia vulpina},
  author = {Nathan L. Stephenson and Philip W. Rundel},
  year = {1979},
  doi = {10.1016/0305-1978(79)90003-6},
  url = {https://pubs.usgs.gov/publication/1007442},
  note = {Source identifier: 1007442}
}