TY  - RPRT
TI  - Problems using density gradients. Brief report.
AU  - G H Bergold
AU  - R Mazzali
PY  - 1970
DO  - 10.1007/bf01241674
UR  - https://pubmed.ncbi.nlm.nih.gov/5529070/
ID  - 5529070
ER  -