TY  - RPRT
TI  - Letter: Information retrieval system.
AU  - C H Altshuler
AU  - W N Hollister
PY  - 1976
DO  - 10.1378/chest.69.1.136a
UR  - https://pubmed.ncbi.nlm.nih.gov/1244276/
ID  - 1244276
ER  -