TY  - RPRT
TI  - The relational database model and multiple multicenter clinical trials.
AU  - B A Blumenstein
PY  - 1989
DO  - 10.1016/0197-2456(89)90004-4
UR  - https://pubmed.ncbi.nlm.nih.gov/2691206/
ID  - 2691206
ER  -