TY  - RPRT
TI  - Selection in a preferred provider organization enrollment.
AU  - J E Billi
AU  - C G Wise
AU  - S I Sher
AU  - L Duran-Arenas
AU  - L Shapiro
PY  - 1993
UR  - https://pubmed.ncbi.nlm.nih.gov/8270421/
ID  - 8270421
ER  -