305,562 SONN ULLA Longitudinal studies of dependence in daily life activities among elderly persons : methodological development, use of assistive devices and relation to impairments and functional limitations / Ulla Sonn. - Oslo [etc.] : Scandinavian University Press, 1996. - 35 s. s wykr. ; 25 cm (Scandinavian Journal of Rehabilitation Medicine, ISSN 0346-8720 ; suppl. no 34)