TY  - RPRT
TI  - Exact conditional and unconditional sample size for pair-matched studies with binary outcome: a practical guide.
AU  - P Royston
PY  - 1993
DO  - 10.1002/sim.4780120709
UR  - https://pubmed.ncbi.nlm.nih.gov/8511446/
ID  - 8511446
ER  -