TY  - RPRT
TI  - A note on robust variance estimation for cluster-correlated data.
AU  - R L Williams
PY  - 2000
DO  - 10.1111/j.0006-341x.2000.00645.x
UR  - https://pubmed.ncbi.nlm.nih.gov/10877330/
ID  - 10877330
ER  -