TY  - RPRT
TI  - One facilitator, two PBL groups.
AU  - J L Keller
AU  - D Burns
PY  - 1997
DO  - 10.1097/00001888-199704000-00002
UR  - https://pubmed.ncbi.nlm.nih.gov/9125933/
ID  - 9125933
ER  -