1. Agency for Healthcare Research and Quality 2013 Guide to Inpatient Quality Indicators: Quality of Care in Hospitals - Volume, Mortality, and Utilization http://www.qualityindicators.ahrq.gov/Modules/IQI_TechSpec.aspx
2. Ash , A. S. E. F. Stephen A. L. Thomas S. T. Normand T. A. Stukel J. Utts 2012 Statistical Issues in Assessing Hospital Performance http://www.cms.gov/Medicare/Quality-Initiatives-Patient-Assessment-Instruments/HospitalQualityInits/Downloads/Statistical-Issues-in-Assessing-Hospital-Performance.pdf
3. Use of the All Patient Refined-Diagnosis Related Group (APR-DRG) Risk of Mortality Score as a Severity Adjustor in the Medical ICU;Baram;Clinical Medicine: Circulatory, Respiratory and Pulmonary Medicine,2008
4. Racial or Ethnic Differences in Hospitalization for Heart Failure among Elderly Adults: Medicare, 1990 to 2000;Brown;American Heart Journal,2005
5. CMS 2014 Press Release: CMS Issues Hospital Inpatient Payment Regulartion Centers for Medicare and Medicaid Services http://www.cms.gov/Newsroom/MediaReleaseDatabase/Press-releases/2014-Press-releases-items/2014-08-04.html