RT Journal Article SR Electronic T1 Qualitative Research: Case study evaluation JF BMJ JO BMJ FD British Medical Journal Publishing Group SP 444 OP 446 DO 10.1136/bmj.311.7002.444 VO 311 IS 7002 A1 Keen, Justin A1 Packwood, Tim YR 1995 UL http://www.bmj.com/content/311/7002/444.abstract AB