Charlson, Mary E.; Pompei, Peter; Ales, Kathy L.; MacKenzie, C. Ronald «A new method of classifying prognostic comorbidity in longitudinal studies: Development and validation». Journal of Chronic Diseases, 40, 5, 1987, pàg. 373–83. DOI: 10.1016/0021-9681(87)90171-8. PMID: 3558716.
Sharabiani, Mansour; Aylin, Paul; Bottle, Alex «Systematic review of comorbidity indices for administrative data». Medical Care, 50, 12, 12-2012, pàg. 1109–18. DOI: 10.1097/MLR.0b013e31825f64d0. PMID: 22929993.
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Charlson, Mary E.; Pompei, Peter; Ales, Kathy L.; MacKenzie, C. Ronald «A new method of classifying prognostic comorbidity in longitudinal studies: Development and validation». Journal of Chronic Diseases, 40, 5, 1987, pàg. 373–83. DOI: 10.1016/0021-9681(87)90171-8. PMID: 3558716.
Sharabiani, Mansour; Aylin, Paul; Bottle, Alex «Systematic review of comorbidity indices for administrative data». Medical Care, 50, 12, 12-2012, pàg. 1109–18. DOI: 10.1097/MLR.0b013e31825f64d0. PMID: 22929993.