TY  - RPRT
TI  - Interaction assessment: Rationale and a test using plants
AU  - J.M. Emlen
AU  - D.C. Freeman
AU  - F. Wagstaff
PY  - 1989
DO  - 10.1007/bf02270916
UR  - https://pubs.usgs.gov/publication/70161971
ID  - 70161971
ER  -