TY  - RPRT
TI  - Partial shifts.
AU  - B N Summers
AU  - J S Dwyer
PY  - 1992
DO  - 10.1136/bmj.305.6864.1297-a
UR  - https://pubmed.ncbi.nlm.nih.gov/1477595/
ID  - 1477595
ER  -