TY  - RPRT
TI  - A SAS macro for constrained randomization of group-randomized designs.
AU  - M Ashraf Chaudhary
AU  - Lawrence H Moulton
PY  - 2006
DO  - 10.1016/j.cmpb.2006.04.011
UR  - https://pubmed.ncbi.nlm.nih.gov/16870302/
ID  - 16870302
ER  -