TY  - RPRT
TI  - Laboratory and field testing of commercial rotational seismometers
AU  - R.L. Nigbor
AU  - J.R. Evans
AU  - C. R. Hutt
PY  - 2009
DO  - 10.1785/0120080247
UR  - https://pubs.usgs.gov/publication/70036564
ID  - 70036564
ER  -