TY  - RPRT
TI  - A device for generating zero, linear, or exponential gradients or their combinations.
AU  - S KATZ
PY  - 1963
DO  - 10.1016/0003-2697(63)90052-6
UR  - https://pubmed.ncbi.nlm.nih.gov/14031332/
ID  - 14031332
ER  -