S. M. O'Brien, D. R. Clarke, J. P. Jacobs, M. L. Jacobs, F. G. Lacour-Gayet, C. Pizarro, K. F. Welke, B. Maruszewski, Z. Tobota, W. J. Miller, L. Hamilton, E. D. Peterson, C. Mavroudis, and F. H. Edwards. An empirically based tool for analyzing mortality associated with congenital heart surgery. The Journal of Thoracic and Cardiovascular Surgery, Elsevier, volume 138, issue 5, pages 1139-1153, November 2009.

S. M. O'Brien, J. P. Jacobs, D. R. Clarke, B. Maruszewski, M. L. Jacobs, W. I.  H. L., C. I. Tchervenkov, K. F. Welke, Z. Tobota, G. Stellin, C. Mavroudis, J. L. Hamilton, J. W. Gaynor, M. Pozzi, and F. G. Lacour-Gayet. Accuracy of the Aristotle Basic Complexity Score for Classifying the Mortality and Morbidity Potential of Congenital Heart Surgery Operations. The Annals of Thoracic Surgery, Elsevier, volume 84, issue 6, pages 2027-2037, December 2007.

K. F. Welke, J. P. Jacobs, and K. J. Jenkins. Evaluation of quality of care for congenital heart disease. Seminars in Thoracic \& Cardiovascular Surgery: Pediatric Cardiac Surgery Annual, Elsevier, volume 8, issue 1, pages 157-167, 2005.