TY  - RPRT
TI  - Quantitative variation and the ecological role of vulpinic acid and atranorin in thallus of Letharia vulpina
AU  - Nathan L. Stephenson
AU  - Philip W. Rundel
PY  - 1979
DO  - 10.1016/0305-1978(79)90003-6
UR  - https://pubs.usgs.gov/publication/1007442
ID  - 1007442
ER  -