TY  - RPRT
TI  - A cross-over trial with categorized response.
AU  - A G Hawkes
PY  - 1971
DO  - 10.1111/j.2044-8317.1971.tb00451.x
UR  - https://pubmed.ncbi.nlm.nih.gov/5557518/
ID  - 5557518
ER  -