TY  - RPRT
TI  - A study of variations in output.
AU  - I M RICHARDSON
AU  - W Z BILLEWICZ
PY  - 1956
DO  - 10.1136/oem.13.1.70
UR  - https://pubmed.ncbi.nlm.nih.gov/13293321/
ID  - 13293321
ER  -