TY  - RPRT
TI  - Interaction in crossover studies: a modified analysis with more sensitivity.
AU  - T J Cleophas
PY  - 1994
DO  - 10.1002/j.1552-4604.1994.tb03992.x
UR  - https://pubmed.ncbi.nlm.nih.gov/8021332/
ID  - 8021332
ER  -