TY  - RPRT
TI  - Multilevel mediation modeling in group-based intervention studies.
AU  - J L Krull
AU  - D P MacKinnon
PY  - 1999
DO  - 10.1177/0193841x9902300404
UR  - https://pubmed.ncbi.nlm.nih.gov/10558394/
ID  - 10558394
ER  -