On the special needs of blind and low vision seniors : research and practice concepts / ed. by Hans-Werner Wahl and Hans-Eugen SchulzeThe many faces of health, competence and well-being in old age : integrating epidemiological, psychological and social perspectives / ed. by Hans-Werner Wahl ... [et al.]The many faces of health, competence and well-being in old age : integrating epidemiological, psychological and social perspectives / ed. by Hans-Werner Wahl ... [et al.]