TY  - RPRT
TI  - Improved density gradient separation techniques using sodium polytungstate and a comparison to the use of other heavy liquids
AU  - G.L. Skipp
AU  - I. K. Brownfield
PY  - 1993
DO  - 10.3133/ofr92386
UR  - https://pubs.usgs.gov/publication/ofr92386
ID  - ofr92386
ER  -