Halvorsrud, Liv The conceptualization and measurement of quality of life in older adults: a review of empirical studies published during 1994-2006. [electronic resource] - European journal of ageing Dec 2007 - 229-246 p. digital Publication Type: Journal Article; Review ISSN: 1613-9372 Standard No.: 10.1007/s10433-007-0063-3 doi