TY  - RPRT
TI  - Two-stage sampling in pharmaceutical applications.
AU  - J Shao
AU  - S C Chow
PY  - 1993
DO  - 10.1002/sim.4780122104
UR  - https://pubmed.ncbi.nlm.nih.gov/8296110/
ID  - 8296110
ER  -