1. Thoracic surgeons and their surgical practice;Bloom;J Thorac Cardiovasc Surg,1979
2. Trends in specialty certification;Haug;Bull Am Coll Surg,1977
3. A Joint Study by CPHA and IMS America Ltd;Hospital Record Study,1977
4. Surgical work loads in a community practice;Hughes;Surgery,1972
5. Moore FD, Boyden CM, Murphy N, et al: SOSSUS Manpower Subcommittee mathematical predictive method for Board-certified specialists on a population base, in Surgery in the United States: A Summary Report of the Study on Surgical Services for the United States (long form report). Sponsored jointly by the American College of Surgeons and the American Surgical Association. July, 1975, vol I, part V, sections II and III, pp 626–638