TY  - BOOK
AU  - Park,Rolla Edward
ED  - United States.
ED  - Rand Corporation.
TI  - Explaining variations in hospital death rates: randomness, severitu of illiness, quality of care 
T2  - A Rand note
CY  - California
PB  - Rand Corporation, 1990
N1  - Includes bibliographical references
ER  -