TY  - RPRT
TI  - AN APPARATUS FOR SAMPLING DENSITY GRADIENTS.
AU  - N NEWTON
PY  - 1965
DO  - 10.1016/0003-2697(65)90279-4
UR  - https://pubmed.ncbi.nlm.nih.gov/14302465/
ID  - 14302465
ER  -