TY  - RPRT
TI  - Limits of retrospective power analysis
AU  - Patrick D. Gerard
AU  - David R. Smith
AU  - Govinda Weerakkody
PY  - 1998
DO  - 10.2307/3802357
UR  - https://pubs.usgs.gov/publication/1014927
ID  - 1014927
ER  -