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Schläpfer, Thomas E.; Groner, Marina; Lavoyer, Edouard; Fisch, Hans-Ulrich (1991). Visual Masking: A Reliable Measure for the Assessment of Cognitive Dysfunction in the Elderly? Journal of gerontology, 46(4), P157-P161. The Gerontological Society of America 10.1093/geronj/46.4.P157