1. Medicare: A Strategy for Quality Assurance,1990
2. Results of the Medicare Beneficiary and Physician Focus Groups;Walker,1990
3. Medicare: A strategy for quality assurance, I : A recapitulation of the study and a definition of quality of care;Lohr;QRB,1991
4. Medicare: A strategy for quality assurance, II: Site visits;Donaldson;QRB,1991
5. The focussed interview;Merton;American Journal of Sociology,1946