TY  - RPRT
TI  - Controlling for varying effort in count surveys: An analysis of Christmas Bird Count data
AU  - W.A. Link
AU  - J.R. Sauer
PY  - 1999
DO  - 10.2307/1400592
UR  - https://pubs.usgs.gov/publication/5223393
ID  - 5223393
ER  -