TY  - RPRT
TI  - Study designs for dependent happenings.
AU  - M E Halloran
AU  - C J Struchiner
PY  - 1991
DO  - 10.1097/00001648-199109000-00004
UR  - https://pubmed.ncbi.nlm.nih.gov/1742381/
ID  - 1742381
ER  -