TY  - RPRT
TI  - Selection of controls.
AU  - J A Childress
AU  - J D Childress
PY  - 1990
DO  - 10.1016/0196-6553(90)90172-o
UR  - https://pubmed.ncbi.nlm.nih.gov/2403221/
ID  - 2403221
ER  -